You've described the process: When the Vendor misses the bogus return, it's sent back to another sales bin, and resold. Next, the Customer accepts it, or return

You've described the process: When the Vendor misses the bogus return, it's sent back to another sales bin, and resold. Next, the Customer accepts it, or returns it again. At this point, the loop should exit, but we already know the Vendor is imperfect. I've wondered how often this iterate before exiting. The worst case is fun to speculate on, since both are motivated to pass that hot potato.