What about including a tracker with a high priced delivery? Unless I am mistaken, you can track your package anywhere and at anytime. With these, you put one in the middle of the chip stack or in every rack of chips. If the box is open and contents taken, the tracking chip is taken along with the chips. Could be useful evidence if you want to go down that road. If the delivery is successful, the buyer can mail the tracker back to the seller. Thoughts?
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late to the party, but this guy did something similar with a scammer:
it's a $25 insurance policy if you can get someone to physically track it down for you, but be sure to remove the speaker before you mail it so you don't alert the thief! my son's e-bike has one hidden in it and we removed the speaker.