Board Thread:Online Discussion/@comment-24400038-20171209050731/@comment-26213507-20171209160902

Here you go: "Fences in this game have a limited number of items that can be sold to each day. This starts out at 50 items per day, but can be increased by 120% for each rank of the relevant Legerdemain skill placed." -- Fence (Online)

It appears that the number resets after a day, and that the counter is for all fences, and not just the ones in a particular Outlaws Refuge.