If real, the stamps would be worth more than $118,000. The federal agency, which routinely inspects packages on arriving and departing international flights, said the postage was snatched after agents spotted its poor quality, low invoice value, routing and the “extraordinary” effort to conceal the lot. With counterfeiting becoming more advanced — with most consumers unable to detect a difference — officials said there’s been an uptick in fake stamps around high volume card holidays, like Valentine’s Day. Authentic postage stamps are produced at the US Bureau of Engraving & Printing in the US.