Discovered online while trying to solve the Quick Generic Challenge For the Mortals (Quick Generic Challenge For the Mortals Mystery Cache (GC3GN90) , one of the most least challenging mystery puzzles I've not yet entirely solved, in that I haven't yet signed the log (only because I'm at work and have to wait until this evening to sign the log).
I was literally still in diapers when DB Cooper disappeared with a giant wad of stolen cash but have heard enough about the story that I'll vote for the theory that he's still alive today, and probably shops at Costco regularly because, well, $200,000 doesn't buy what it used to and Costco has some great deals.