Forgive me if I'm misreading, but I'm a little confused... You own this precise piece, but you're unclear to which movie it was attributed? Or do you already know the answer and intend this post as a fun challenge? Your title requesting "help" would seem to suggest the former.
If so, the watermark identifies this as an old Propstore listing image and it appears to show a close-up on a custom display, which in Propstore's case almost as a rule will have the film title prominently featured. So I assume you do not retain the display, nor the rest of the listing photos, nor the COA?
Certainly an odd circumstance to find yourself in, but if that's the case, it might be simplest to contact Propstore directly (email@example.com). I have no idea if they would be willing to issue a replacement COA, but if you can send them the image along with a photo showing how you definitively matched the listing image to your piece, it's at least worth a try.