I'm a little confused. So you want to potentially give the police access to additional evidence (via your passwords/decryption keys) in the hopes that they will

I'm a little confused. So you want to potentially give the police access to additional evidence (via your passwords/decryption keys) in the hopes that they will fuck something up or make a custodial error in the process of recovering it? You have everything to lose by giving them your passwords, even if you are innocent of the charges. You're under no obligation to give them your passwords or empty the contents of your brain in their presence. Why give them the opportunity to find something else? Who knows whether the machine has something they will find interesting. You shouldn't be providing LE with anything like this absent the advice of your attorney. There's too much to lose. I really want to encourage you to read the following: https://www.eff.org/issues/know-your-rights https://www.eff.org/issues/know-your-rights