That might not exactly take a Tony Mendez-grade forger, but making a good one is probably not going to be within the skill set of random warehouse workers who enjoy agitating expensive shipments. They have to find a decent forger, get in contact, and arrange for the service. That wasn't going to be cheap to begin with, but the package is constantly in motion, so now someone else has to emplace the forged detector in a different location.

Assuming the warehouse worker can afford all that, someone offering anti-tamper-bypass-as-a-service is going to run headfirst into the FBI, SCA, and other well-resourced government organizations with which a sane individual would never consider fucking. That does not lead to rising property values in Tokyo.