I tried making a list of reels that have no audio available:
MISSING D REELS
D-20, (Original, Bluestone/Cadkin)
D-25/D-26
D-31/D-32 ***
D-34
D-36
D-38, (Last cue only)
D-45/D-46
D-51/D-52, (Original?) ***
D-55/D-56, (Original, unknown composer)
D-67 to D-90, (Existence unconfirmed aside from 89/90)
D-91/D-92, (Replacement, Dan Kirsten) ***
D-105/D-106, (Original, Eugene Poddany)
D-113/D-114, (Existence unconfirmed)
D-115/D-116
D-121/D-122, (Existence unconfirmed)
D-125
MISSING L REELS
L-31/L-32
L 57/L-58, (Original, Raoul Kraushaar, MR cues)
L-61/L-62
L-63
L-99/L-100
L-105/L-106, (Original, Eugene Poddany)
L-111/L-112, (Original, Green/Loose/Cadkin)
L-205/L-206
L-207/L-208
L-215/L-216
L-217/L-218
MISSING M REELS
M-33, (Original, Bluestone/Cadkin)
M-37
M-47/M-48
M-51/M-52
M-59/M-60
M-81/M-82
M-93/M-94
M-97/M-98
M-121/M-122
M-134
M-145/M-146
M-153/M-154
MISSING S REELS
S-3 to S-14 ***
S-16 to S-22
S-25/S-26
S-27/S-28
S-33 to S-46
S-47 to S-82, (53/54 were previously thought to be the last release, but 83/84 has recently resurfaced)
MISSING X REELS
X-1/X-2, (Replacement, Ib Glindemann)
X-7, (Original and Ib Glindemann replacement)
X-8, (Loose/Seely and Ib Glindemann replacements)
X-11/X-12
X-13/X-14
X-15/X-16
X-18
X-19/X-20
X-22
X-23 to X-42
X-46
X-49 to X-58
X-63/X-64
X-65/X-66
X-68 to X-71
X-73 to X-80
X-83 to X-94
X-99 to X-108
X-113-X-114
X-115/X-116
X-119/X-120
X-123 to X-132
X-135/X-136
X-139 to X-146
X-151 to X-162
X-165/X-166
X-169 to X-188
X-190 to X-256
X-259/X-260
X-265/X-266, ("Classroom" 1 thru 16 are on MMSE-28 under the title "Live and Learn")
X-267/X-268
X-273/X-274
Most of the Bluestone/Cadkin material from the D series is present on CPM Music albums. It’s reasonable to assume that D-20’s cues are scattered somewhere in CAS 001, 006, 014, or 027.
D-31/D-32 each have a single cue that's on the Night of the Living Dead soundtrack.
The D-46 folder on Soulseek is actually D-9/D-10, so this one hasn't surfaced yet.
D-51/D-52 - Okay, there are possibly 2 different versions here. Production Music Wiki lists the year as 1958 which the HB code would imply, though stackjackson reported that the content on their copy has cues from Sam Fox's SF 1019, released in 1968. If there is a 1958 version, all we know is its corresponding catalog number for now (HB-2251/HB-2252). The 1968 release is the Raumpatrouille soundtrack, albeit in mono and missing more than half of its content.
D-53/D-54 - While this reel is available, all we know are the track titles and composer (William Loose). The catalog number, year, and cue IDs are unknown. All I can tell is that the IDs should start with TC since some of the cues are related to those on D-55/D-56, also composed by Loose. Any additional info is appreciated. Interestingly, an index in my Hi-Q catalog book shows 53/54 in the “War” sub-section of the “Drama” category, but none of the compositions really mesh with that vibe. Could there be another edition of this reel?
There’s practically no information on anything between D-67 and D-88. I’d hazard a guess that they were discontinued quite early on. D-71 thru 76 and 79/80 were apparently part of a lot sold on eBay several years ago, but that’s all that has surfaced concerning the titles in this range.
https://www.rootsvinylguide.com/ebay_items/lot-of-45-capitol-library-hi-q-production-music-vinyl-lp-records-hi-q-vintageD-89/D-90 - Names, composers, and IDs are available, but the actual audio hasn't surfaced yet.
D-91/D-92 - Track 1 and 4 thru 11 are on Media Music MEM-10, which can be found on Soulseek.
D-115/D-116 has a page on the National Museum of American History's site. It has a catalog number of JB-2814/JB-2813, indicating a 1959 release. Any other information is currently unknown.
https://americanhistory.si.edu/collections/nmah_669142S-11 - There are 2 cues on the Night of the Living Dead soundtrack, though they're indexed as a single track to match their use in the film.
S-13/S-14 - 7 of the 40 cues are present on the Night of the Living Dead soundtrack.
This should be the best place to mention it, but there are 3 cues in NOTLD that are presumably from the Hi-Q library, but with additional electronic effects applied. These are Attacked, Dead Connection/Corpse on the Stairs/Ben Arrives, and Bonfire. The true title for Attacked isn't known since the piece wasn't even listed on the film's cue sheet. The other 2 tracks primarily consist of identifiable cues (Weird Eerie ZR-87C from D-32 and Eerie Heavy Echo L-1216 from D-24 respectively) along with the effects. What cues they were originally is probably lost to time unless more Hi-Q reels surface. Any S or X reels with ‘dramatic’ cues could be the source. It might even be one of the undocumented D reels. Who knows for certain? You’re probably wondering why the stings are on the soundtrack despite seemingly no one knowing what the original titles are. Well, it's likely that the versions Waxwork used on their vinyl reissue came directly from the film's music and effects stems.