So...These can be found in the newer crates? Well that explains le drop. Thanks to Eldric for re-evaluting the 4 keys range :>.

Sellers/solds:

http://www.tf2outpost.com/trade/18961976 (selling for 2 keys)

http://www.tf2outpost.com/trade/18948436 (selling for 2 keys)

http://www.tf2outpost.com/trade/18959952 (selling multiple for 2 keys + 5ref)

http://www.tf2outpost.com/trade/18942049 (selling multiple for 2 keys + 7ref)

http://www.tf2outpost.com/trade/18936011 (sold at 3 keys)

http://www.tf2outpost.com/trade/18947134 (sold 1 at 3 keys and selling another at 3 keys)

http://www.tf2outpost.com/trade/18952475 (selling for 3keys)

http://www.tf2outpost.com/trade/18961709 (selling for 3keys)

http://www.tf2outpost.com/trade/18960201 (selling for 3 keys

http://www.tf2outpost.com/trade/18958833 (selling at 3keys)

http://www.tf2outpost.com/trade/18951902 (selling for 3 keys)

http://www.tf2outpost.com/trade/18960116 (selling for 3 keys)

http://www.tf2outpost.com/trade/18947823 (selling for 3 keys)

http://www.tf2outpost.com/trade/18958906 (selling for 3 keys)

http://www.tf2outpost.com/trade/18960255 (selling for 3 keys)

http://www.tf2outpost.com/trade/18946395 (selling for 3 keys)

http://www.tf2outpost.com/trade/18960444 (selling for 3 keys)

http://www.tf2outpost.com/trade/18938581 (selling for 3 keys)

http://www.tf2outpost.com/trade/18950535 (selling for 3 keys)

http://www.tf2outpost.com/trade/18953698 (selling multiple at 3 keys)

http://www.tf2outpost.com/trade/18956809 (selling multiple at 3 keys)

http://www.tf2outpost.com/trade/18938508 (multiple selling for 3 keys)

Unsolds

http://www.tf2outpost.com/trade/18880973 (4 keys -> 4 days)

http://www.tf2outpost.com/trade/18873317 (4keys -> 4 days)

http://www.tf2outpost.com/trade/18872600 (4 keys -> 4 days, has an add but still unsold)

http://www.tf2outpost.com/trade/18862390 (4 keys -> 4 days, wth is with these 4 day unsolds #2spooky)

http://www.tf2outpost.com/trade/18940253 (4 keys -> 1 day, fairly young though)

http://www.tf2outpost.com/trade/18936023 (3 keys + 2ref -> fairly young though)

http://www.tf2outpost.com/trade/18791300 (3.8 keys -> 1 week)

^Too many umbumped 4 keys sellers :'|

Super easy to get one at 3 keys and with the massive amount of 3 keys sellers, don't think 4 keys should be included any more.

Please let me know if I have any dupes, broken, mislabeled or invalid links and feel free to provide more, constructive criticism or counter proof.

NUUUUU, orange star > green star (´Д｀。)