Backing? For Pink Rose 32c Stamps Not Opened Booklet Of 30

I peeked inside of a booklet of thirty 32c pink rose stamps. USPS cut up another pink rose booklet to use the backing of the self-adhesive stamps. Is this normal? I cannot seem to find the listing for 30 stamps of the pink rose in a booklet. Is it Scott Numbers 2492e and 2492f included in this booklet?

Maybe it is 2 panes of 15 stamps (2492b)?

I would guess that you are looking at one of the "makeshift" vending machine booklets of 1996. Presumably one of BK178C thru BK178F. Look in the booklet section of a US Specialized catalogue. All 4 booklets contain 30 stamps, all 2492. BK178C contains 2 panes of 2492b. BK178D contains 2 panes of 2492f with one stamp removed from the top or bottom row of each pane. BK178E contains 1 pane each of 2492e & 2492f. BK178F contains panes 2492b & 2492f with the bottom right stamp removed from the latter pane.
For completeness, I will mention the following:
2492a was a self-contained booklet of 20 stamps accompanied by a "time to reorder" label. 2492b was a pane of 15 with the same label." 2492e was a pane of 14 and 2492f was a pane of 16.
2492e & 2492f both contain blocks of 4 or 6 stamps in some combination ... the strips between the blocks were peeled away so that the panes could be easily folded for insertion into the VMB format.
... Edited to fix typos ...
Added: BK178F is the rarest variety & has CV of $225

Ok I looked again it was 2 panes of 15. Thanks.