How can police get IP address of deactivated Facebook account?

So, I created a fake Facebook account and sent a message to a friend that was questionable. The friend didn't know it was me. I regretted what I did and soon after blocked my friend from the fake account, deleted the messages, deactivated the account and it is now marked to be deleted in 14...

The friend didn't know it was me. I regretted what I did and soon after blocked my friend from the fake account, deleted the messages, deactivated ...

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