If I counted right and kept track of all unissued takes there will be 251 tracks.
Overview of the complete as possible of Duke Ellington's 1924-1946 studio recordings.
Earliest Ellington 1924-1926
The Blu Disc, Up-to-date, Paramount and Gennett recordings are on Masters Of Jazz vol. 1
Brunswick/Vocalion 1926-1931
Early Ellington The Complete Brunswick and Vocalion Recordings of Duke Ellington 1926-1931 3 CD set
Discovered later and therefore not included:
27772-B Tishomingo Blues on Jazz Oracle 8047 A Gift From The President
E31372 Office Take Oklahoma Stomp unissued
Pathé, Banner, Cameo Perfect, Romeo, Okeh and Columbia 1925-1931
There has never been a complete reissue of this Sony owned material. There are 97 tracks in total. 94 of them are included on Masters of Jazz vol. 1-12. 50 are included in "The OKeH Ellington"
Not included:
150586-1 Double check stomp (never reissued take)
10357-3 Rockin Chair (never reissued take)
10359-3 Im so in love with you (this would have been track 1 of vol. 13 that never appeared)
It is on classics 605 Duke Ellington 1930-1931
Classics 539, 542, 550, 559, 569, 577, 586, 596, 605 and Neatwork RP 2009 and RP 2018 cover the same period and also have 94 tracks out of 97. But 108079-1 East St. Louis Toodle-oo is missing. It is on Masters Of Jazz Volume 3.
Masters Of Jazz also includes movie soundtracks that explains why MoJ has one CD more.
RCA Victor 1927-1934, 1940-1942, 1944-1946
The Complete RCA Victor recordings 1927-1973 (24 CD set)
1927-1934 disc 1-7
1940-1942 disc 8-13
1944-1946 disc 14-17
Missing:
053623-2 A Lull At Dawn on Neatwork RP 2051 Duke Ellington volume 8 track 14
053624-2 breakdown Ready Eddy Neatwork RP 2051 Duke Ellington volume 8 track 16
CD 10 track 22 = CD 10 track 23
CD 10 track 24 = CD 11 track 3
Hit Of The Week 1930
Sing You Sinners and St. James Infirmary
Masters Of Jazz Volume 9
Brunswick, Vocalion, Columbia, Okeh, Master and Variety 1932-1940
Mosaic 11-248 The Complete 1932-1940 Duke Ellington and His Famous Orchestra
Mosaic 7-235 The Complete 1936-1940 Small Group Sessions
Decca London 1933
Classics 637 Duke Ellington and his orchestra 1933
Neatwork RP 2033 Duke Ellington volume 4 (1933-1936)
These CDs Also include both takes of A souvenir of Duke Ellington
The Decca Session is also included on "The British Connexion 1933-40" On Jazz Unlimited
Musicraft 1946
CD Happy-Go-Lucky-Local Musicraft MVCD-52
My Old Flame with Mae West was not a commercial recording it is on Classics 646 Duke Ellington and his orchestra 1933-1935 track 15.
The Duke Ellington solo version of Ive got to be a rug cutter is not a commercial recording either. It is included on Le Chant Du Mondes Lhistoire du jazz vocal 1911-1940 CD 7 track 4.
Based on The New Duke Ellington Story On Records (New Desor) by Luciano Massagli and Giovanni M. Volonté, The New Desor Correction sheets (www.depanorama.net/desor/index.htm), articles in The Duke Ellington Music Society Bulletin edited by Sjef Hoefsmit (www.depanorama.net/dems/)
and my own collection.