holographic seal tape can be defeated by using a syringe to inject acetone just under its surface, temporarily disabling the adhesive. after the attacker is done, they just put it back.
- purism makes laptop signing key, fingerprints available on puri.sm, github, keybase, and business cards.
- glittery nail polish over the screwholes. this is discussed on several sites.
- signed picture of nail polish emailed to user and available by user login.
the glitter pattern is random and very difficult to reproduce.
one problem is blink testing, taking your own picture and overlaying to spot differences, is also difficult. you cant put your camera in the same place, have the same settings, and lighting that the factory did. the only way i can think of around this is a few pics, or maybe a short animation showing a few different angles, and having the user visually inspect that the pattern is close enough. it should still be difficult or time consuming for the attacker to make a close pattern. a well funded adversary could have the resources to build a custom glitter sprayer, so this may not deter a nation state.