Actually, it would appear that you have sales among your links, now that I've looked through them. Both the 2 ref ones seem to have sold at least one each.

As for how to find sales - bookmark relevant trades and track sales by looking in the seller's backpack and checking if the item is still there (easiest by clicking the item on the trade, and then "inventory" from the menu, if it displays a different item then it's most likely sold. Might want to confirm by searching by item name just to be sure and comparing the item's original ID if you find any other items of the same type) or you can use google: site:tf2outpost.com/trade "item name", filter results to the past week, check links one by one.

By the way, for future reference, always sort your links by categories - sellers, sold, unsold, buyers etc. It makes it much easier for the voters to review the proof.