A box that contains the most valuable, either monetary or emotionally, items of a collection to be evacuated in the event of a fire/flood/baliff. Originally the tool of a record collector, it can refer to a collection of any kind. Also named "peel box" after the legendary DJ John Peel, and "panic box" in case of ermergency.
"Did you find any wants in my crates?"
"Not really, I'd prefer to see your fire box"