Sale 1:

Sold with 4 buds, 2 keys and ~2 keys of sweets for a Searing Plasma Team Captain (buds were 13 at the time)

(250*0.9) - 52 - 2 - 2 = 169 keys

http://www.tf2outpost.com/trade/24836437

Seller Before: http://backpack.tf/profiles/76561198094714199?time=1422432000

Seller After: http://backpack.tf/profiles/76561198094714199?time=1422518400

Sale 2: (outlier, quicksell)

Sold for 80 keys pure

80 keys

http://www.tf2outpost.com/trade/25065592

Calling this a quick sell because he had an offer of 120 in unusuals, but after having this up for a while he suddenly went for 80 pure.

Seller Before: http://backpack.tf/profiles/76561198069594656?time=1428044400

Seller After: http://backpack.tf/profiles/76561198069594656?time=1428303600

Sale 3:

Sold with a Massed Flies Private Eye for a duped Stare From Beyond Dark Falkirk Helm and a Burning Flames Fruit Shoot

(70 + 80)*0.9 - 31 = 104 keys

http://www.tf2outpost.com/trade/24753898 144

Seller Before: http://backpack.tf/profiles/76561198080075371?time=1422172800

Seller After: http://backpack.tf/profiles/76561198080075371?time=1422259200

Notes:

Mini for the duped Stare From Beyond Dark Falkirk Helm:

Sold for 5 buds pure (buds were 14 at the time)

5*14 = 70 keys

http://www.tf2outpost.com/trade/24562212

Seller Before: http://backpack.tf/profiles/76561198043826027?time=1421740800

Seller After: http://backpack.tf/profiles/76561198043826027?time=1421827200

Mini for the Massed Flies Private Eye:

Sold for a Disco Beat Down Buckaroos Hat and an Orbiting Fire Dread Knot

(11 + 23)*0.9 = 30.6 rounding to 31

Seller Before: http://backpack.tf/profiles/76561198104628338?time=1429167600

Seller After: http://backpack.tf/profiles/76561198104628338?time=1429254000

Conclusion:

Sales at 169 and 104 and a quick sale at 80. Taking the final range at 100 to 170 keys.