Sale 1:

https://backpack.tf/profiles/76561198135388328#!/compare/1533427200/1533513600

https://backpack.tf/profiles/76561198272079801#!/compare/1532822400/1533513600

Sold for 11 keys(ID Match)

Sale 2:

https://backpack.tf/profiles/76561198272079801#!/compare/1534377600/1534550400

https://backpack.tf/profiles/76561198170098378#!/compare/1534464000/1534550400

Sold for 12 keys + 9 ref

Sale 3:

https://backpack.tf/profiles/76561198170098378#!/compare/1534982400/1535068800

https://backpack.tf/profiles/76561198044468624#!/compare/1534982400/1535068800

Sold with 13 ref for DP Ground Control

Use there.

Sale 4:

https://backpack.tf/profiles/76561198044468624#!/compare/1535155200/1535328000

https://backpack.tf/profiles/76561198410145031#!/compare/1535241600/1535328000

Sold with 7 keys in sweets for P Fetti Tossle

Use there.

Sale 5:

https://backpack.tf/profiles/76561198410145031#!/compare/1535328000/1535414400

https://backpack.tf/profiles/76561198282858365#!/compare/1535068800/1535500800

Sold for 10 keys + 11,66 ref

Sale 6:

https://backpack.tf/profiles/76561198282858365#!/compare/1535068800/1535500800

https://backpack.tf/profiles/76561198049072204#!/compare/1535414400/1535500800

Sold for 10 keys + ~2 keys in sweets

Total is 12 keys

Sale 7:

https://backpack.tf/profiles/76561198049072204#!/compare/1535673600/1535846400

https://backpack.tf/profiles/76561198058266974#!/compare/1535760000/1535846400

Sold for 12 keys

Sale 8:

https://backpack.tf/profiles/76561198058266974#!/compare/1535760000/1535846400

https://backpack.tf/profiles/76561198277620182#!/compare/1535673600/1535932800

Sold for Blizzardy Buckaroo + ~ 1 key in sweets

Buckaroo Mini:

https://backpack.tf/suggestion/5b95969144325a20353d6ff7

Suggestion for 11.5 keys

Total is 12.5 keys

Sale 9:

https://backpack.tf/profiles/76561198277620182#!/compare/1535932800/1536019200

https://backpack.tf/profiles/76561198054136616#!/compare/1535760000/1535932800

Sold with ~1 key in sweets for Planets YWN

https://backpack.tf/suggestion/5b95ca9ccf6c757cea57be0e

Suggestion for 14 keys

Total is

Sale 10:

https://marketplace.tf/items/30042;5;u56

Close to Buyers, low.

Total Sales @:

10, 11, 12, 12, 12, 12.5, 15 keys

Let's call 10 & 11 low, based on buyers up to 9,

Taking 12 - 15 keys.