Glitter nail-polish is the best tamper-evident seal

One major motive for tampering with something is to plant a bug (hardware, software, firmware or some combination) on it. The longer a bugged device continues to be used normally, the more valuable the data likely to be revealed.

It isn’t about redress, because you aren’t getting any, it’s about whether or not you end up unknowingly continuing to use a device with a keylogger, screen scraper, or other nasty embedded.