Heard about this on tv and radio and figured I'd check it out. Claims I have over $600 from an old mortgage. Had to get proof together and notarized and sent it in (notary told me she had done these before and they are real). From what I heard this is legit...the scams are the ones that make you pay...this is free and appears to be a CO state website. So far they have received my claim and reviewing it, so I'll let you guys know if it works, but worth a shot.
https://colorado.findyourunclaimedproperty.com/
P.S. If you do get anything back I accept a finders fee