Wouldn’t a tampering party simply peel back a sticker and replace it (maybe with a shot of glue to help it stick like new)? Peeling off stickers without damaging them is an art (hint: don’t use just your fingernail), but it’s hardly impossible.
The glitter nailpolish seems like a cooler idea, although it’s going to hurt repairability when all of your screwheads are filled in with acrylic. It also doesn’t help against USB stack injection attacks, but you would have to be Osama Bin Laden’s resurrected zombie to warrant that level of attack.
Honestly, just filling in all of the screwheads on your box with epoxy is already pretty good tamper resistance.
