I picked up some chips in a trade. They have DON on one side and $1 and $2 on the back. They came with a little card that states" Records show $1 black and $2 red 1993 Klamath Falls, OR. The chips were used at the Blue OX and BJ's Tavern in Klamath Falls, OR in licensed games". Has anyone seen these chips before, or have information to verify this.