Aliens Attic Mode Stuck 14/15

I am convinced that it is glitched. I’ve been at 14 out of 15 for weeks and IM GOING CRAZY!!!

I’ve checked everywhere (yes including the secret room and behind the book case)…

I’ve read every google post about this and tried every spot.

I’ve given up looking for a few weeks because it’s not here but I keep checking places just in case.

It’s just not here anywhere.

Taking any suggestions that might help or else I’ll just go back to ignoring this broken quest. Thx