Mysterious 1994 stamp booklets of Azerbaijan

Towards the end of 1994, Azerbaijan issued two topical sets: "Birds of prey" (5 stamps and a miniature sheet, issued 15 November 1994) and "Wild cats" (5 stamps and a miniature sheet, issued 14 December 1994). Both sets have since been spotted imperforate, but it is extremely doubtful that they were ever issued in Azerbaijan in that form.
A few years ago I became aware that both sets had also spawned stamp booklets. For both sets, a booklet was produced, with a block of 4 of the 20m value and a block of 4 of the 25m value. Both blocks are tied to the inside of the cover by the official First Day of Issue postmark. Here is the "Birds" booklet:

Note that the number on the outside is repeated on the inside, tying both blocks of stamps.

The "Cats" booklets exists in two subtypes. Low-numbered copies are in this format:

Copies with higher numbers are in a slightly smaller format:

I am not aware of any catalog that lists these booklets. I occasionally see them offered at fantastic prices (and they're certainly not common), but nobody collects Azerbaijan, he said bitterly. Print runs are guesswork only but I'd guess 2000 for the Birds booklet and 4000 for the Cats booklet? It's interesting that the two values used in the booklets had slightly higher print runs than the other stamps in the set, so perhaps this was a way of using up the extras.

I've heard some unsubstantiated rumors that these booklets were on sale at philatelic exhibitions where Azermarka had a stand, and that certainly makes sense to me. They look like official Azermarka productions, but they are not even listed in Azermarka's own catalogs...