He didn't "find" them, he paid for them. In fact, the person who sold them, likely received a much higher price for them (as opposed to other no-name tools) because the OP thought they were genuine Snap-On with a lifetime warranty. That warranty goes both ways... just check out eBay and all of these (likely) retired mechanics selling their 20 yr old SO torque wrench for over $100.
At any rate, I'd forget the trucks as they aren't going to want to warranty your tools, you'll likely have to give SO customer service a call @ 1-877-762-7664. Although, they appear to require an original receipt and even if you received one from the garage sale, I'm not sure they'd consider it acceptable. It's worth a try to at least give them a call, though. It is a bit disappointing to me that SO charge 10x - 20x what Harbor Freight does for a socket or a ratchet, but you can walk into any HF with your $10 broken ratchet and they'll swap it out, while an $88 F80 3/8 SO ratchet will likely require you paying for shipping and even then the warranty is likely conditional.