Duo might not have been much of a construction type, but he had experience with errand running, and being pretty quick about it too. Nails needed across town three flights up? Sure, not a problem. And if he spotted a few pieces of gold here and there along the way, he sure wasn't going to ignore it. It sure more than made up for the lack of a tip if he only got there on time instead of early. Of course, the gold grabbing itself was something he did rather sneakily. Now you see it, now you don't. Even when he's carrying a stack of boxes. "Coming through!"