I am no expert on your question ... but I doubt the Stardust or Castaways can be redeemed since they no longer exist.
You can check w/ any Boyd Casino cage to see if they with redeem the Stardust but I doubt it since the Dust has been closed
for a while. I am also certain no casino cage would redeem the Castaways chip since they had been closed for many years.

Mahoneys and Opera House, "as far I know are still open" ... so those two should be redeemable there.

Chris Graham, R-7654