Found these recently, and am pretty sure they are quite old. Probably mid-late 90's Id say.

The one on the left is from the Gold Coast and the right is the Rio Suite Hotel. Both say 'Limited Edition Ten Dollar Gaming Token' and are .999 fine silver. Sorry for the blurry pics, these things are impossible to take pics of clearly due to the glare from the middles :

If anyone can give me a year and value, that would be cool. Also, if anyone wants them and makes a fair offer, I have no problem selling them to whoever might collect these.

Just send an email/msg.