Um... off the top of my head, I'm not sure. Stamped US Mail gets postmarked, with a date and location. However, that's just the place where the thing was mailed; you could drive anywhere to send a letter or a package. UPS labels have return addresses -- these days you can track the package, though in L&C-world they probably can't.
If I wanted to send something anonymously, I think I'd use a fake return address, and arrange for it to get mailed from out of town, or better yet, out of state. It could be tracked back to that post office, but by then I'd be long gone, so the trail would end.
PJ
"You told me you weren't like other men," she said, shaking her head at him when the storm of laughter had passed.
He grinned at her - a goofy, Clark Kent kind of a grin. "I have a gift for understatement."
"You can say that again," she told him.
"I have a...."
"Oh, shut up."
--Stardust, Caroline K
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