Well, I found a
slug, 2 quarters and a penny in my Millipede, gave the quarters to my kids, I kept the slug for testing coin mechs and chucked the penny (kids don't even want em).
In Q*bert I found several tokens from Showbiz Pizza Place (was originally a showbiz owned machine) a ton of Peter Piper Pizza tokens and tickets, and one Family Fun Center token.
Everything else was devoid of money or tokens. I do usually save the tokens to use in the machines, I have them on freeplay for now just because I don't have enough tokens for every machine, but that will change soon.