I have only included trades that have clearly had an offer made and an accept from the last week. Trades with no offers, obvious lowballs (1 ref), selling only in sets, or where the seller hadn't responded in more than a week I left out. There are also a couple old trades asking 2.5-3 keys with buyers accepting but no seller comments for week/s (I considered these trades to be abandoned.)

http://www.tf2outpost.com/trade/9289886 asking 4keys sold 4

http://www.tf2outpost.com/trade/8902588 asking 4 keys sold 1 in last week 75 total

http://www.tf2outpost.com/trade/9382832 asking 4 keys sold 1

http://www.tf2outpost.com/trade/9776018 asking 4 keys sold 3

http://www.tf2outpost.com/trade/10413785 selling at current price seems to be sold out to another trader if inventory is right

http://www.tf2outpost.com/trade/8152558 asking 3 keys sold several

http://www.tf2outpost.com/trade/10400996 sold several @ 4 keys

http://www.tf2outpost.com/trade/8243205 sold some @ 4 (refused 3 key offer)