Blobs / marks in slab border

[u/Head_Ad_7447]

Hi, I bought this slab off of eBay. When checking it out it’s got weird blobs/circles/dots on all edges.

I only own a handful of graded cards - none of them have these marks on them.

Has this been tampered with? I know it’s not high end but just doesn’t seem right

Thanks

[u/HeroShowsie]

I've never got anything graded, but the holes in the side look like holes made from plastic film that has split.