Can't totally confirm, but it appears part of the Mechanic's lore is a Fallout reference we can possibly add to a Trivia section if anyone feels like doing so/feels it's necessary. "improvised explosive devices from a lunch box, a couple of bottlecaps from soda bottles, a cherry bomb and a homemade sensor device." 

Bottlecap Mines in Fallout 3 were built from the same materials. Nice little reference tidbit regardless.

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