The termination certification has me state I've returned all equipment (I have), that I haven't broken my mobile device (was never issued one), and that I'll continue to be bound by various rules in our handbook after leaving the company (it contains things like a non-compete that lasts four years after leaving the company).
Do I have to sign it?
I looked online and it seems like they can't withhold my paycheck, and I don't see any advantage to me in signing. In addition, there are things in the handbook none of us particularly like, and this seems like a way of making sure we can't contest it, even after we leave. I'd rather not sign something that says I agree to be bound by it after I leave.