The moderator tools show that, in the last 90 days, out of 48 questions closed with custom close reasons, 31 are autograph identification questions. This number is greater than questions closed as duplicates (18) or primarily opinion-based (15).
Which means autograph identification requests are the top reason for closure on our site. That's why I suggest the mods to add a template for it (something which has been done on other SE sites):
Identification questions are off-topic, because they tend to attract low-quality and low-effort posts. The community has decided to no longer support these questions. Please refer to this meta post for additional details.
The request below is for SO employees. To implement something like this for us sometime in the future when they are not too busy:
On Movies and TV Stack Exchange, a warning message pops up telling users that they don't accept identification questions. A similar thing would be very helpful for us as well.