The issue is that this is the check for my reimbursement from the State of Michigan for the money that they illegally deducted from my (and all other Michigan teachers') paychecks (before they changed the law so it was just unethical, but not illegal). It was already mailed to the wrong address (after I had made certain to update my address), returned, and then sent back to me.
For a variety of reasons, we still use the credit union in Jackson that I have used for my entire life. Unfortunately, I have no way of depositing such a large amount such as this check up here (most of our deposits and withdrawals are done electronically). Thus, I sent the check to my parents for them to deposit in my credit union, using priority mail specifically so I could track it ... and now it's disappeared.
Something really doesn't want me to get that money.