Just bung them in and have a look would be my suggestion. I had a similar find a while ago,under orders was having a clear out of what she like to call junk. I prefer to call it you never know when it might come in handy stuff. anyway found a couple of USB drives and plugged them in to find I must have used them when I had XP, when networking PC's was not as easy as it is now. Must have used these to transfer programs ETC from PC to PC.
Ended up formatting them, might come in handy one day.LOL.