Tamper evident seed phrase storage

I have a hardware wallet and keep my seed phrase on a piece of paper about the size of a business card separately from the wallet. I only need this for recovery rather than usual access.

I want to be able to store that piece of paper in such a way that it will be evident if someone has had access to it.

I've seen the dedicated seed phrase storage devices but they seem to be needlessly expensive.

What alternatives are there? How do you keep your seed phrase safe in a non-digital medium?