"First editions are always good, but unless it stated that all were hand signed or the like I don't see it helping to prove the autograph is what is called "live ink". Some of the images you posted earlier, among those 4, showed what…"
"These are all different. Likely hand signed but would need to see it in hand. It would be irresponsible of me to say it is hand signed when I can't be certain."
"That is a good sign because these images do look like prints to me. Open a new file folder and see and save as many different signatures you can find and post them."