[AAARRT]

Hi, I recently purchased a lot of cards and have two plastic holders that I honestly can't figure out how to open. I know that sounds dumb but I am not sure what to do. They don't have screws and they are not graded cards just plastic holders. They don't have any slots or open corners that I can use as a wedge. They don't seem to slide up down or sideways???? Does anybody have a suggestion????
I figure someone has used these themselves and can tell me what to do.

Thanks
Art