When Kaito finally found Pandora, he didn't simply keep it like most people thought he would. He returned it... and then had Jii buy it from its owner three days later. It was a rather spectacular waist of fourteen-million Yen, but it would have been much more expensive if it wasn't a doublet, and it was well-worth-it to Kaito. For one, returning and then purchasing it had thrown Snake off his trail for a while, giving him enough time to figure out how to destroy it. And secondly, Kaito didn't want to be a real thief...
Jii had readily agreed.