"Sorry, left one of my keys in the mountains, you will need to hold them hostage until late spring in order for me to retrieve it."
In that case, you'd be betting that the robbber's laziness is greater than his greed and malice, which is a dangerous assumption. Plus, he could return when the last privkey becomes available and start the robbery all over again. Your only option at that point would be to move somewhere that the robber can't find you.
What I'm trying to point out is that you shouldn't be trying to trick criminals. You should be shooting them when they attack you.
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