Seemed like a fishing expedition. I checked his return area code, and it's Fort Lauderdale. Hmm, wonder if someone skipped out on payment, and it's a collection agency or something. Maybe he's the son of Jeff. I used to get both calls and mail for some folks looking for Jeff, 20 years ago.
Either that, or maybe the much-wanted-by-the-law Mark Frates has gotten my last name, and has a new angle. But then, if it were, he'd be using my address. After all, the neighbor even caught him in my backyard once, when I wasn't home, recognised him as the neer-do-well son of the former owner, and told him to get on out of there.