where was perrault and francois transferred too after they sold their team?

The text just says that they had to buy fresh dogs and deliver more mail.

But so many were the men who had rushed into the Klondike, and so many were the sweethearts, wives, and kin that had not rushed in, that the congested mail was taking on Alpine proportions; also, there were official orders. Fresh batches of Hudson Bay dogs were to take the places of those worthless for the trail. The worthless ones were to be got rid of, and, since dogs count for little against dollars, they were to be sold.