Lets do this ^.^

Sellers

http://backpack.tf/classifieds/search/517/1/0 - 1 at 2.1 (4 days), 1 at 2.2 (1 day)

< 2.2

http://www.tf2outpost.com/trade/12292436 - 2 keys, 1 day

http://www.tf2outpost.com/trade/12333171 - 2, 4 hours

http://www.tf2outpost.com/trade/12283904 - 2, 1 day

http://www.tf2outpost.com/trade/12313248 - 1.7, 18 hours

http://www.tf2outpost.com/trade/12136081 - 2, 6 days

http://www.tf2outpost.com/trade/12153793 - 2, 5 days

2.2

http://www.tf2outpost.com/trade/11514810 - 3 weeks (bp.tf prices, sold?)

http://www.tf2outpost.com/trade/12315738 - 16 hours

http://www.tf2outpost.com/trade/12111749 - 1 week

http://www.tf2outpost.com/trade/12011888 - 1 week

http://www.tf2outpost.com/trade/11683700 - 3 weeks

http://www.tf2outpost.com/trade/12107264 - 1 week

http://tf2tp.com/trade.php?trade=9582608 - 5 hours

http://tf2tp.com/trade.php?trade=9556930 - 14 days

Sold

http://tf2tp.com/trade.php?trade=9584786 - 2

No others I could find :(

Conclusion

Plenty readily available at 2 keys, and 1 seems to have sold at 2. Quite simple.

Constructive criticism is appreciated ^.^