Tamper-proofing those should be relatively easy with the techniques in the page at least. The difference being that someone would have to copy the whole glitter

Tamper-proofing those should be relatively easy with the techniques in the page at least. The difference being that someone would have to copy the whole glitter pattern to a new casing, (or open up the existing one, so you'd have to make that evident too, I'm not sure how easy to open those actually are).