I was expecting more stealthy techniques, like the old sticking a hair and tape on a door or carbon shoe prints under the carpet type tricks. I was imagining people spraying invisible coatings on USB sockets or something.

The problem with doing something as elaborate as wrapping stuff in vacuum packed beans is that it draws attention and provides an adversary plausible deniability due to customs inspections etc, "Oh sorry the DEA had to inspect your package but it's fine, here's your beans too".