unfortunately several of these professional seals are only a bit more obscure, but not much harder to open than a zip tie. Introduction to Tamper Evident Devic

unfortunately several of these professional seals are only a bit more obscure, but not much harder to open than a zip tie. Introduction to Tamper Evident Devices from datagram at defcon 19 https://www.youtube.com/watch?v=W07ZpEv9Sog https://www.youtube.com/watch?v=W07ZpEv9Sog is interesting to watch