Re. question: Incorrectly Deleted User - user31385. The issue I raised in the question has been resolved, apart from a 400 point bounty that has still not been restored to my account.
In the comments on the answer I was told this by animuson:
It needs a developer to fix. Essentially, when a profile is deleted, any bounties awarded to them are changed so that TargetUserId = null, but reassociating posts manually does not change that TargetUserId back to the user. It just leaves it null, so the system doesn't think it belongs to you despite it being on your post.
How can I contact a developer in order to restore this bounty to me?