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I'd separate it into individual bills and hide in half-assed places. Searchers would end up scrambling and getting sloppy, rushing to find bills before anybody else. Like an Easter egg hunt, their greed would be their undoing, because I can tell you from experience that 2hr is not enough time to find 100 of anything in a madhouse, even $100 bills.

But also money in my country are coated plastic so perhaps I could hide a portion of it in the shower trap, which is easy to quickly hide (but gross). The easily found Easter Cash would discourage anybody slowing down enough to be thorough. Consider the mind games an investment.