I was browsing Reddit before work today when I came across this post:
The majority of people in the post are saying that all of the cards are fake, however, some of the base set 1st edition cards look really convincing to me. Have any of you run into fake cards where you couldn’t tell the difference?
For me, the corners are way too square and the borders are too thin. The colours on the back look a little off. However, I probably wouldn’t have thought this immediately if I wasn’t told it were fake.
But the 1st edition stamp will differ for other sets. Not sure if the reddit post was about base set or not, but seems like fake stamps do exist and even grading companies have made mistakes on them
Looks like the poster deleted the post and album. I saw it while it was up and while some looked good many were oversaturated, had wrong holo patterns, and had inconsistencies that are known with proxys like their borders. For that many first editions for that price, generally if there’s one fake then immediately be suspect of all of them. Somehow fakes like to show up in groups.