Lets see if I can reach my goal of pricing 20 of the new Summer items!

Sold

http://www.tf2outpost.com/trade/12785045 - 2 keys

http://www.tf2outpost.com/trade/12784835 - Key + 3 ref

http://www.tf2outpost.com/trade/12778473 - 2 keys + 1 ref

http://www.tf2outpost.com/trade/12778016 - 2 keys

http://tf2tp.com/trade.php?trade=9632547 - 2 keys + 1 ref

http://www.tf2outpost.com/trade/12775531 - 2 keys

http://www.tf2outpost.com/trade/12772257 - 2 keys

http://www.tf2outpost.com/trade/12773296 - 1:1 with Cool Cat (2-3 keys)

http://www.tf2outpost.com/trade/12771660 - 2 keys

http://www.tf2outpost.com/trade/12771313 - 2 keys

http://tf2tp.com/trade.php?trade=9631782 - 2 keys

http://www.tf2outpost.com/trade/12764313 - 1 key + 4.33

http://www.tf2outpost.com/trade/12757746 - 2 keys

http://www.tf2outpost.com/trade/12756002 - 2 keys

http://www.tf2outpost.com/trade/12753809 - 2 keys

http://www.tf2outpost.com/trade/12752995 - 2 keys

http://www.tf2outpost.com/trade/12751593 - 1 key + 5.33

http://www.tf2outpost.com/trade/12750542 - 2 keys

http://www.tf2outpost.com/trade/12750376 - 2 keys

http://trade.tf/listings/search/Sell/Unique/Delinquent%27s%20Down%20Vest/all/10 - Proof it was 2 keys for above

http://www.tf2outpost.com/trade/12750327 - 2 keys

http://www.tf2outpost.com/trade/12749865 - 2 keys

http://www.tf2outpost.com/trade/12749072 - 2 keys

http://www.tf2outpost.com/trade/12747281 - 1:1 with Graybanns (2-3 keys)

http://www.tf2outpost.com/trade/12731556 - 2 keys

http://www.tf2outpost.com/trade/12733545 - 2 keys + 2 ref

http://tf2tp.com/trade.php?trade=9629429 - Possibly 1:1 with Macho or Banns (both 2-3 keys each) OR 2 keys

http://www.tf2outpost.com/trade/12726914 - Potentially 2 keys

http://www.tf2outpost.com/trade/12724518 - 1:1 with Cool Cat (2-3 keys)

http://www.tf2outpost.com/trade/12723618 - 2 keys (x2)

http://www.tf2outpost.com/trade/12721954 - 2 keys

http://www.tf2outpost.com/trade/12720686 - 1:1 with Cool Cat (2-3 keys) (Potentially)

http://www.tf2outpost.com/trade/12720620 - 2 keys

http://www.tf2outpost.com/trade/12719114 - 2 keys

http://www.tf2outpost.com/trade/12717609 - 2 keys

http://www.tf2outpost.com/trade/12717463 - 2 keys

http://www.tf2outpost.com/trade/12716725 - 2 keys

http://www.tf2outpost.com/trade/12716237 - 1 key + 5 ref

Conclusion

2 key seems to be the main and middle value its going for. Not enough proof for higher or lower.

Help / Consturctive Criticisim / Additional Proof / Counter-Proof is ALWAYS welcome! :D