Mozart: Piano Concertos / Schiff, Vegh
Allmusic Placeholder: http://www.allmusic.com/album/mozart-klavierkonzerte-mw0001856836
Complete info: http://www.deutschegrammophon.com/en/cat/4481402
Bernard Haitink: The Philips Years
Allmusic Placeholder: http://www.allmusic.com/album/haitink-the-philips-years-mw0002560001
Complete info: http://www.deutschegrammophon.com/de/cat/4785671?sort=newest_rec&SearchString=haitink+years&ADD_OTHER=1
Noriko Ogawa - Debussy - The solo piano works
In my original post, I did not include the links. For those albums that others have not posted links to:
A Festival of Ballet (50 CD Set): EMI Classics http://www.allmusic.com/album/festival-of-ballet-box-set-mw0001875928
11 Kurzopern (Original Electrola One Act Operas 1975-1980) (11 CD SET): Warner Classics http://www.allmusic.com/album/11-kurzopern-the-original-electrola-one-act-operas-mw0002356507
ICON - Annie Fischer: The Complete London Studio Recordings (8 CD Set): Warner Classics http://www.allmusic.com/album/the-complete-london-studio-recordings-mw0002621782
Arthur Rubinstein plays Chopin (10 CD): Sony Classical https://www.discogs.com/Arthur-Rubinstein-Arthur-Rubinstein-plays-Chopin/release/5408135
Arturo Toscanini: The Complete RCA Collection (85 CD): RCA Red Seal http://www.allmusic.com/album/arturo-toscanini-the-complete-rca-collection-mw0002321063
Arturo Toscanini: The HMV Recordings (6 CD): Warner Classics http://www.allmusic.com/album/icon-arturo-toscanini-mw0002472661
Bach Masterworks - The Original Jackets Collection [50 CD][Limited Edition]: Deutsche Grammophon https://www.discogs.com/Bach-Masterworks-The-Original-Jackets-Collection/release/5081132
Bernard Haitink: The Symphony Edition [36 CD][Limited Edition]: Decca Classics http://www.allmusic.com/album/bernard-haitink-the-symphony-edition-mw0002611220
Bruno Walter conducts Mahler (7CD): Sony Classical http://www.allmusic.com/album/bruno-walter-conducts-mahler-mw0002311512
Bruno Walter conducts Mozart (6 CD): Sony Classical http://www.allmusic.com/album/bruno-walter-conducts-mozart-mw0002186751
Carlo Maria Giulini - The London Years (17 CD): Warner Classics http://www.allmusic.com/album/carlo-maria-giulini-the-london-years-mw0002586602
Charles Munch conducts Romantic Masterworks (8 CD): RCA Red Seal http://www.allmusic.com/album/charles-munch-conducts-romantic-masterworks-mw0002115736
David Zinman: Great Symphonies Zurich Years (50CD): RCA Red Seal http://www.arkivmusic.com/classical/album.jsp?album_id=1216670
Phase Four Stereo Concert Series [41 CD][Limited Edition]: Decca Classics http://www.allmusic.com/album/phase-4-stereo-stereo-concert-series-mw0002698063
Icon: Edwin Fischer - Piano Playing from the Heart (12CD): Warner Classics http://www.allmusic.com/album/icon-edwin-fischer-piano-playing-from-the-heart-mw0002025202
Ernest Ansermet: French Music (32 CD): Decca Classics http://www.arkivmusic.com/classical/album.jsp?album_id=1012778
Ernest Ansermet: Russian Music (33 CD): Decca Classics https://www.amazon.com/Ernest-Ansermet-Russian-Nicolai-Rimsky-Korsakov/dp/B00J498SOI
Ernest Ansermet: The Great European Tradition (31CD): Decca Classics http://www.allmusic.com/album/the-great-european-tradition-mw0002758005/releases
Eugene Ormandy conducts 20th Century Classics (12CD): Sony Classical http://www.allmusic.com/album/eugene-ormandy-conducts-20th-century-classics-mw0002407752
All of the above have been submitted to Rovi for consideration. We waitâŚ
Many thanks @joel for your work in encouraging Rovi to fill these gaps!
Please keep the missing boxsets coming. I might not hit Rovi with them immediately (the list I sent amounted to more than 2000 individual CDs), but once we have some traction on the initial list, any new ones will be submitted.
Seiji Ozawa: The Philips Years http://www.allmusic.com/album/seiji-ozawa-the-philips-years-mw0002739350
Seiji Ozawa: German Masterworks: Bach, Beethoven, Brahms, Bruckner http://www.allmusic.com/album/german-masterworks-bach-beethoven-brahms-bruckner-mw0002887988
Seiji Ozawa: The Complete Warner Recordings http://www.allmusic.com/album/seiji-ozawa-the-complete-warner-recordings-mw0002843707
Gustav Leonhardt Edition (Warner Classics - 21 CDs): http://www.allmusic.com/album/gustav-leonhardt-edition-mw0001407395
Leonard Bernstein Edition: Concertos & Orchestral Works (80 CDs, Sony Classical) http://www.allmusic.com/album/leonard-bernstein-edition-concertos-orchestral-works-mw0002744902
LâOiseau Lyre - Classical & Early Romantic (Decca Classics 50 CDs) https://www.discogs.com/Various-Classical-Early-Romantic/release/8267831
Ana-Marija Markovina: C. P. E. Bach: The Complete Works for Piano Solo (26 CDs)
Allmusic Placeholder: http://www.allmusic.com/album/carl-philipp-emanuel-bach-the-complete-works-for-piano-solo-mw0002627993
Complete Info for the individual albums is here: http://tinyurl.com/j5hssec
By the way: This is unbelievably good music, and almost completely unknown. Do yourself a favor and listen to it.
Julian Bream - The Complete Album Collection
No Allmusic Placeholder
Complete Info here: http://www.qobuz.com/at-de/album/julian-bream-the-complete-album-collection-julian-bream/0886443567153
Sony Baroque Masterpieces (60 CDs)
Allmusic Placeholder: http://www.allmusic.com/album/baroque-masterpieces-various-box-mw0001585897
Zuzana RĹŻĹžiÄkovĂĄ, complete Bach:
Apparently, spelling her name right (with accents) is too hard for Tivo/RoviâŚ
It looks like Roon has picked up RCA Living Stereo Vol. 2
I have just checked and canât see any change to the situation of my box sets. 
Can anyone else see any improvements?
My Delius 15oth Anniversary Edition (18CD box set) is now being recognised in RoonâŚ
The Delius album is recognized, but the metadata is blank. It is just filling in the metadata from your tags, not from Rovi, or whatever provider Roon is using.
Yes, thatâs true - but at least the set is now in the list of albums to choose from. A few months back it wasnât even in the list (although AllMusic had a placeholder for it). So, a baby step forward, perhaps?
Thatâs @joelâs work not Rovi improving their metadata.
Diamond Classics (16CD box set) ist not identified properly.
One question, does Roon check constantly for new data content and add it to the library or must the user looks for new content manually?
Roon checks each album weekly.