The singles that were unperforated came with a toy(came remember the toy). They had a sold black plastic seal around the entire card that provided very little protection and made it super easy to bend when opening. This is a live listing but hopefully relevant enough: www.ebay.com/itm/114473585418
It is literally just a a black trashbag looking seal with no markings and almost no protection. It would be a nightmare trying to open these and find a specific card in mint condition.