Have you considered getting a safe-deposit box?

I tend to just stick all my 2FA backup codes into "secure notes" in LastPass.

That sort of defeats the purpose of 2FA though. Now if your LastPass database is compromised, they have access to your 2FA codes as well.

True. I think it's a bit of a security compromise for convenience. Having backup codes stuck in a folder somewhere at home is only useful if I need to regain access to one of my accounts while I'm at home.