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That depends on whether I can separate the bills and keep the ones they don't find, or if it's an all or nothing system. There's a loose floorboard in one room, so if it's all or nothing, I'd lift that and chuck the package as far as possible under there, replace the board, then mess up multiple other places in the house.

If they can be separated, there are 100 notes, and they're individually going in every gap, crevase and hole I can find. Between the floor boards, under carpeting, in the gaps in the bottom of the couch, I have a stapler, so pop the bases loose on some chairs, then restaple them shut, tape them under floor level cupboards. I'd have to move fast, but their unlikely to find everything, so I'd be finding random $100 notes for ages afterwards, because there no way I'd remember everywhere I put them.