John,
I happened to call the cages at the 4 Queens and the Fremont this morning. The lady at the 4Queens said that they would take ANY chip that they ever issues. This surprised me since I was sure that someone had posted that some had redemption notices issued for them. The lady at the Fremont said that they would take any except some "extremely" old LEs. I specifically asked about Richard Petty chips from 1998 and she said they were still good. I asked her if that policy applied to all of the Boyd properties and she said yes.
Take if for what it's worth since you sometimes get a different answer from each cage person..........
I haven't called the other casinos you are asking about.