This happened about 10 years ago. I listed a 5.00 chip from Depot in Deadwood in new condition on e-bay, I had pictures of both sides. I got the chip from my 5.00 group of chips and listed for 10.00, James book said 10-20. I didn't look closely at listing, but soon got a message that my chip was a error chip as it had 25.00 on the reverse, had same colors and inserts both sides I just didn't notice error. James book had the error chip new 1000.00. What a great honest club member, can't remember his name, but sent him some chips free for his honesty, I could have sent the chip without looking at reverse. Yes, we do have great honest members in our club. Wish I could remember his name a senior with grey hair. Love to give him a shout out.