One cool feature of BitBox 02 bitcoin only is that you can use an optional passphrase on top of your existing seed: if you leave it blank you get access to "main wallet", but for each different passphrase you derive a different wallet from the main seed, and this passphrase never gets memorized on the device.

This mean that you can safely store btc on a derived wallet as your "secret stash", and if in a bad situation (fiscal control or theft attemp) you can input a different passphrase to show a totally different balance.

You should store the seed and the passphrase in a separate place to be completely safe.