"On the network, Nate said it's partially that it's extremely uncommon in this part of the world," Altair said, "and partly that it's a difficult lock in and of itself." Unspoken was the implication that once he and Ari knew how to pick this unpickable lock, they would have the advantage of being the only two thieves who knew how to get past it—not to mention the advantage they would have over whatever hapless nobles attempted to use it to secure their own goods.
"And don't worry," he added in response to her second question. "I have a ... business interest in the machinist who owns the workshop. I know where it is."