A couple of things: first, like all things UPS, there is much flexibility if you aren't on a 'hit list'. If you ARE, or even close to a 'hit list', the letter of the law will be strictly applied. If you have to ask...you're not on a 'hit list'. Second, I'm not a steward like you, Bubblehead, so my advice might be spotty, but I would cut my losses, get back to work and not mention another word about this. Be glad you got paid what you did, be glad no one found about and never mention another word about this. It's probably too late now, as you're already done with work, and I hope it went well. But this reminds me of a cheating spouse who is guilt-ridden, and decides to admit the wrong-doing to the other spouse. It NEVER ends well.
And ignore the haters here. It's what they do. There is ALWAYS a post like Gazelle, who is full of frustrations, and this is the only place they can release their inadequacies.
Sorry about your loss.