You are going to make PMs public or give it to the police?
I will give them to the police if the police ask for them. Otherwise, I may post them publicly to help people find Pirate and obtain justice.
Pirates are hostis humani generis.
I'm not going to preserve the privacy of someone who stole 500,000 BTC.There could be some other information in those messages that might indite other members. It would be like the wikileaks of bitcoin.