By putting the chips in a tinfoil container like a sandwich bag lined with aluminum wrap, the detector fails to read the missing chips. did this at the Mikohn demo two years ago and it worked. They did not like my demenstration so I did not repeat at the wheel table you and I visited.....not at the same time. Amazingly, few chips worth collecting this year since they all seem to have generics from Paulson and chipco...boring.