These were issued as a house chip, then danny gans replaced them as the new house chip. Since the attack many of these chips were bought from the tables and cage by sellers trying to cash in on a quick buck, making it harder to find them. If you like poor condition chips and have time to beg the dealers to look, then you can still get them off the tables. I as a collector would never buy a heavy used chip, when I know that thousands exist in MINT condition.