YouTube user Steve1989 holds the beat-up can, turning it for the camera, tenderly running his thumb along its rusty surfaces. “Definitely has a nice patina to it, a little bit of rust,” he says, his excitement restrained but palpable. “Let’s check this out.” The can and its contents are British, and more than 70 years old. Steve—assuming his real name is Steve, as he hasn’t returned my requests for an interview—gingerly opens the can and lays out its contents: a fruit bar (“I’ve always wanted to try a World War Two-era fruit bar,” he says), some biscuits, and chewing gum on an old tin army tray. Then, he digs in, unwrapping each little morsel and popping them into his mouth.[…]