Sale 1

http://www.tf2outpost.com/trade/25265187 | Sold for 25 keys

http://backpack.tf/profiles/76561198074399034?time=1428950395 | Before

http://backpack.tf/profiles/76561198074399034?time=1428950395 | After

Clearly not QS, guy does not mention QSing in trade and had on OP for month before it sold

Sale 2

http://backpack.tf/profiles/76561198088419275?time=1428668319 | Before

http://backpack.tf/profiles/76561198088419275?time=1428668319 | After

Sold for Planets Prancers + Smoking Soviet Gentleman

Prancers = 12 keys

Soviet Gentleman = see mini (15)

15 + 12 = 27 keys

0.9 x 27 = 24.3 ~ 25 keys

(rounding up for sake of range)

Mini for Soviet

Sold for DP Tam O Shanter (~17 keys)

http://backpack.tf/profiles/76561198065234049?time=1423636313 |Before

http://backpack.tf/profiles/76561198065234049?time=1423636313 | After

17 x 0.9 = ~15 keys

Sale 3

http://backpack.tf/profiles/76561198082619062?time=1429787943 | Before

http://backpack.tf/profiles/76561198082619062?time=1429787943 | After

Sold for Morning Glory Backbiter's Billycock

Billycock is 30 keys (no mini required, price up to date)

30 x 0.9 = 27 keys

Sale 4

http://backpack.tf/profiles/76561198138131508?time=1428528123 | Before

http://backpack.tf/profiles/76561198138131508?time=1428562800 | After

Sold with Miami Nights Waxy Wayfinder + B.M.O.C. + 3 keys (and other sweets, but not enough value to mention) for KS Aussie Rocket Launcher

Wayfinder = see mini ( 17 keys)

BMOC = 4 keys

Aussie Rocket = 50 keys (using high end of range because of KS)

Smoking Anger = x

17 + 4 x 0.9 = 20.6~21 (item overpay)

21 + 3 (keys) = 24 keys

24 + x = 50 keys

50 - 24 = x

x = 26 keys

Mini for Wayfinder

http://backpack.tf/profiles/76561198149917617?time=1427050082 | Before

http://backpack.tf/profiles/76561198149917617?time=1427050082 | After

Sold for DP Ye Oiled Baker Boy

Valued at 19 keys

0.9 x 19 = 17 keys

Sale 5

http://backpack.tf/profiles/76561198050693229?time=1427556369 | Before

http://backpack.tf/profiles/76561198050693229?time=1427556369 | After

1 month ago, sold for 4 buds... on day of sale buds were valued at 8 keys each (and were still currency) [ per http://web.archive.org/web/20150329225807/http://backpack.tf ]

8 x 4 = 32 keys

Sales at 25, 25, 27, 26, 32

To me 32 seems somewhat of an outlier to me, 25 - 27 should do.