I'd always heard about this, but the one time I left my backpack in a Yamanote Line train, it was returned with around $2000 worth of cash (in multiple differen

I'd always heard about this, but the one time I left my backpack in a Yamanote Line train, it was returned with around $2000 worth of cash (in multiple different countries' currencies) missing from my wallet. My wallet was really deep inside a bag inside a bag, too, so someone clearly went digging into my backpack.