Dingdong

Sale 1:

https://backpack.tf/profiles/76561198056993391#!/compare/1501372800/1511827200

https://backpack.tf/profiles/76561198198301511#!/compare/1508630400/1509408000

scammur

Sale 2:

https://backpack.tf/profiles/76561198191571269#!/compare/1508889600/1509235200

https://backpack.tf/profiles/76561198337734785#!/compare/1508803200/1508889600

No matcherino

Sale 3:

https://backpack.tf/profiles/76561198429416775#!/compare/1509580800/1509667200

https://backpack.tf/profiles/76561198416990018#!/compare/1509235200/1509667200

iunno, also scammer

Sale 4:

https://backpack.tf/profiles/76561198079662181#!/compare/1509926400/1510012800

ehhh... Could be 14 keys but not sure because histories are weird

Sale 5:

https://backpack.tf/profiles/76561198125247757#!/compare/1513814400/1513900800

https://backpack.tf/profiles/76561198332095008#!/compare/1513382400/1513900800

Sold with Strange Specialized Killstreak Australium Force-A-Nature (10) for Neutron Star Herald's Helm. Sort of used here: https://backpack.tf/suggestion/5a3cd8a244325a2a1b0af250 but not really.

It'll be low for the wraith wrap so most likely better used there

Sale 6:

https://backpack.tf/profiles/76561197999059147#!/compare/1513900800/1514678400

https://backpack.tf/profiles/76561198112564673#!/compare/1514592000/1514678400

Sold for Isotope Specialized Killstreak Blue Mew SMG (Minimal Wear) (15) + 3 keys = 18

Mini for blue mew:

https://backpack.tf/profiles/76561198059936527#!/compare/1507766400/1508198400

Sold for 15 keys

Sale 7:

https://marketplace.tf/items/937;5;u36

http://prntscr.com/huhd3e

Sold for 49.99 / 1.95 = ~26 keys

Sale 8:

https://marketplace.tf/items/937;5;u36

http://prntscr.com/huhd6l

Sold for 42.99 / 1.95 = ~22 keys

Sales at 18, 22, 26

Lemons advised to exclude 18 because 2 pure sales (mp.tf) for higher.

Taking 22-26