Police had my iPhones for 5 hours, one unlocked. I am concerned they gained access or wrote down passwords. Advice?

I have two iPhones, both have my own information and other individuals personal information. I was in an accident, and unfortunately, my iPhones were seized after I logged into one at the station. One had a six digit pin, and to my memory, it was unlocked when police took it. I was just in a 100km accident with major head impact, and not thinking logically when I unlocked my phone.

I am changing the passwords as fast as I can, …

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