Credits go to Julia for this proof

Sale #1:

http://i.imgur.com/XGyANER.png

http://backpack.tf/profiles/76561198081308286#!/compare/1486080000/1486425600

http://www.tf2outpost.com/trade/28753773

http://forums.backpack.tf/index.php?/topic/58027-discounting-morning-glory-soldier-unusual/?p=566832

Sold for $72.73 on the market (72.73 / 2.47 = 29.4 keys)

B/O of 28 keys

Sale #2:

Sold with ~1 key in items for a Purple Confetti Tossle (putdated at 30-32)

http://backpack.tf/profiles/76561198327837250#!/compare/1484956800/1485043200

http://i.imgur.com/YfLaonJ.png

Should be close to other sales.

Sale #3:

http://www.tf2outpost.com/trade/28734841

http://i.imgur.com/AfsC7OQ.png

Sold for 30 keys

Sale #4:

Sold for Ghost Hetman's (16) + Steaming Pusher (14.5)

http://www.tf2outpost.com/trade/28722320

http://backpack.tf/profiles/76561198327837250#!/compare/1484524800/1484611200

Hetman's is outdated, but value should be fairly accurate (it would only need to be worth 14.5 keys to hit the B/O, anyways).

16 + 14.5 = 30.5 keys, B/O was 29 keys