The StackVault is a tamper evident box closed by heat generated from friction.
With room for 26 stainless steel washers (use 304l or 316l) it can protect a 24 word seed plus passphrase and fingerprint. For sealing it, insert the printed hex bit in a drill chuck, fit it into the lid and slowly start spinning the drill while applying a bit of pressure. After about 30 seconds of the drill going brrrrrrrrr, you’ll notice the bin starts turning in your hand, after 5 more seconds of holding it tight, it’s closed for good. The only way to open it, is to evidently destroy the box.