Decided to make this more than a mini :P

Sale 1:

Sold for a clean Max’s + a Genuine Buck Turner All-Stars

(2*0.9) + (28-1) = 28.8 rounding to 29 keys

http://www.tf2outpost.com/trade/25553137

The backpack history is confusing so I just asked him :P

Zapperzz: could you really quickly tell me how much you sold your burning mongolian for?

brendan [HAX]: i sold it for a max + g bucks :P

Zapperzz: Thanks!

Sale 2:

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

(18 + 18)*0.9 = 32.4 rounding to 32 keys

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

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

Notes:

Mini for the Massed Flies Frenchman’s Beret ~18

Sold with a Stormy Storm Head Warmer for a Scorching Flames Madame Dixie

(36.5*0.9) - 18 = 14.85 rounding to 15 keys

Before: http://backpack.tf/profiles/76561198119563409?time=1427007600

After: http://backpack.tf/profiles/76561198119563409?time=1427094000

Conclusion:

Sales at 29 and 32 keys. Taking the final range as 29 to 32 keys.