I'm surprised these are still rare.

Sold for a Searing Plasma Fed-Fightin' Fedora(28 Keys with Overpay)

http://backpack.tf/profiles/76561198169654192?time=1437634800

http://backpack.tf/profiles/76561198169654192?time=1437721200

Sold for a Searing Plasma Noble Amassment of Hats(33 Keys with Overpay)

http://backpack.tf/profiles/76561198071140072?time=1443250800

http://backpack.tf/profiles/76561198071140072?time=1443337200

Sold for an Australium Pro KS Black Box(28 Keys, Offered)

http://backpack.tf/profiles/76561198014728963?time=1440486000

http://backpack.tf/profiles/76561198014728963?time=1440572400

http://backpack.tf/profiles/76561198087369323?time=1440486000

http://backpack.tf/profiles/76561198087369323?time=1440572400

http://www.tf2outpost.com/trade/26873248

Australium Pro KS Black Box mini suggestion

All recent sales on the SCM(Keys = $2.49): http://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Australium%20Black%20Box

$74.34

$80.50

$77.67

$64.19

$75.99

$71.82

$77.76

$71.36

$61.41

$55.48

$71.00

$70.80

$76.70

$71.80

$57.50

$66.70

$63.53

The average comes out at $69.91(Roughly 28 Keys)

Sales seem to fit, 28-33 Keys should be fine.

Additional Proof/Counter-Proof/Constructive Criticism/Feedback is always appreciated.