[zastava128]

Posting here to avoid making a new topic. I've managed to get hold of a couple of "new" books - B. Dimitrijević & D. Predoević The Allied Armoured Units in the Southeastern Europe during the World War Two (sic) (2016) & S. Odić, Desant na Drvar (1980) with a few tidbits of info relevant to the Yugo OOB:

One CV-33/35 LF was present during the Raid on Drvar. Therefore, UNIT 451 start date should be 5/44. Same goes for FORMATION 035.

UNIT 454 (M15/42) - mentioned as used in combat in 4/45. Therefore, start date should be changed to then.

Captured PzKw II J is mentioned in use 9/44-12/46, though probably only a single tank saw actual combat.