um, go out in your backyard build an automatic baseball batting machine with a timer dial to set a delay on the clutch. Outfit it with that really neat bat you keep on the rack over your desk. You know, the one signed by that guy on the Seattle team you can never remember the name of anyway.
Just joking around of course...call the cops...let it be their problem.
Put your package on a narrow support post in front of the machine. Line it up carefully so the machine can't swing a batters strike, set the timer for 10 or 15 seconds, flip the juice on the machine and RUN LIKE....bleep!
If you make it to safety and the bat connects soundly with nothing more than the sort of crunch or crash that occurs with your grandmother's austrian crystal punch bowl all doll'd up as your inheritance in a wrapping paper that suspiciously resembles paper grocery bags, then it is probably safe to say it wasn't a bomb.