> There are ways to exploit this system, but it probably helps against a non-sophisticated attacker.

The LockPickingLawyer on youtube demonstrated that you can just unglue the commonly used tamper seals with a bit of alcohol and reapply them when it had time to evaporate. Someone watching his channel wanted to use a lock sealed with them as proof that LPL was picking locks off camera first and all he got was proof that the seals where useless.