I found this pair of security access cards and tried to return them to the rightful owner. I contacted the card manufacturer, since the cards have a seemingly unique ID number on them. They told me to just destroy them.
Since I’ve always wondered what they are like on the inside, I peeled them apart. I discovered that these things are unnecessarily bulky. Their design could be significantly shrunk to an unobtrusive size that would fit nicely on a keychain. The only downside is that they would be easier to lose.