I didn’t mean to counter :c, I made this suggestion without realizing there was another active one…

Credits to [SHDW] thealexander152 for sales 3 and 4 and the mini.

Sale 1:

Sold for a Burning Flames Magnificent Mongolian

(34*0.9) = 30.6 rounding to 31 keys

http://www.tf2outpost.com/trade/25268981

Buyer Before: http://backpack.tf/profiles/76561198085116555?time=1425715200

Buyer After: http://backpack.tf/profiles/76561198085116555?time=1425801600

Sale 2:

Sold for a Disco Beat Down Conquistador + 1 key

(26*0.9) + 1 = 24.4 rounding to 24 keys

No outpost trade

Buyer Before: http://backpack.tf/profiles/76561198071720427?time=1427007600

Buyer After: http://backpack.tf/profiles/76561198071720427?time=1427094000

Sale 3:

Sold for 2 buds (buds were 14.5 keys at the time)

(2*14.5) = 29 keys

http://www.tf2outpost.com/trade/24426504

Seller Before: http://backpack.tf/profiles/76561198112828741?time=1420185600

Seller After: http://backpack.tf/profiles/76561198112828741?time=1420358400

Sale 4:

Sold with Steaming Chapeau for 3 buds + 9 keys (buds were 11 keys at the time)

(42 - 17.3) = 24.7 rounding to 25 keys

http://www.tf2outpost.com/trade/25230881

Notes:

Mini for the Steaming Chapeau: ~17.3

Sold for Orb Fire Crocleather Slouch + Bills + 2 keys

http://backpack.tf/profiles/76561198160795296?time=1422691200

http://backpack.tf/profiles/76561198160795296?time=1422777600

Mini for the Burning Mongolian ~34

Sold for a Stormy Storm Head Warmer + a Massed Flies Frenchman's Beret

(18+16) = 34

Before: http://backpack.tf/profiles/76561198105972116?time=1428217200

After: http://backpack.tf/profiles/76561198105972116?time=1428303600

Conclusion:

Sales at 24, 25, 29 and 31 keys, taking the final range at 24 to 31 keys.

Am I the only one who thinks this looks like a donut?