@PT Car Washer if any are expired, the company is supposed to turn the money over to your state government (riiiiight) to go into the unclaimed property department, under your name.
If that doesn't work, you could try to get someone in payroll to reissue it. Maybe leave out the part that you neglected to deposit it. Union might be able to help with reissuing the check.
As a last resort, you can file a claim with your state wage & hour board. There may be a hearing with an arbitrator, if they don't just cut the check.
It's way easier to just deposit those suckers.