Sale 1:

https://backpack.tf/profiles/76561198168964967#!/compare/1529020800/1529452800

https://backpack.tf/profiles/76561198125791160#!/compare/1529366400/1529452800

Sold with G Fetti Smokey(19) for Sulphrous Fed Fightin' (48.5) + 4 keys

Total is 33.5 keys

http://www.tf2outpost.com/trade/29683306

B/O of 49 keys

Sale 2:

https://backpack.tf/profiles/76561197988794604#!/compare/1530489600/1531008000

https://backpack.tf/profiles/76561198015363659#!/compare/1530489600/1531267200

Untrace.

Sale 3:

https://backpack.tf/profiles/76561198015363659#!/compare/1531785600/1532044800

https://backpack.tf/profiles/76561198232041512#!/compare/1531699200/1531785600

Sold for Cloudy Coupe(36)

Sale 4:

https://backpack.tf/profiles/76561198162755452#!/compare/1531008000/1531267200

https://backpack.tf/profiles/76561198050062763#!/compare/1530921600/1531094400

Sold for Planets BoA

BoA Mini:

https://backpack.tf/suggestion/5b7606e1cf6c756732283d0b

Suggestion for 33 keys

Sale 5:

https://backpack.tf/profiles/76561198050062763#!/compare/1532995200/1533254400

https://backpack.tf/profiles/76561198145572270#!/compare/1533168000/1533254400

Sold for 32 keys + ~1 key in ref

Total is 33 keys.

Sale 6:

https://backpack.tf/profiles/76561198102833510#!/compare/1529971200/1530316800

https://backpack.tf/profiles/76561198112336424#!/compare/1530144000/1530230400

Sold for Blizzardy Slo-Poke(36) + 1 key

Total is 37 keys

Sale 7:

https://backpack.tf/profiles/76561198112336424#!/compare/1533081600/1533168000

https://backpack.tf/profiles/76561198331167728#!/compare/1533081600/1533168000

Sold with DBD Cloud Crasher(22.5) + ~1 key in sweets for Nebula Translator(70)

Total is 46.5 keys

Sale 8:

https://backpack.tf/profiles/76561198331167728#!/compare/1533081600/1533168000

Untrace.

Sale 9:

https://backpack.tf/profiles/76561198326001685#!/compare/1533081600/1533168000

https://backpack.tf/profiles/76561198179015946#!/compare/1533168000/1533254400

Sold for 34 keys

Sale 10:

https://backpack.tf/profiles/76561198179015946#!/compare/1533254400/1533427200

https://backpack.tf/profiles/76561198165055074#!/compare/1533340800/1533427200

Sold with 7 keys for Strange Burning Broadband Bonnet

Sale 11:

https://backpack.tf/profiles/76561198165055074#!/compare/1533600000/1533686400

https://backpack.tf/profiles/76561198429029268#!/compare/1533600000/1533686400

Sold for Planets Translator + HG Elf Esteem + Smoking Pusher(15.5)

Translator Mini:

https://backpack.tf/suggestion/5b75867c44325a64e24f2257

Suggestion for 12 keys.

Esteem Mini:

https://backpack.tf/suggestion/5b78a3d744325a7e3d59bb28

Suggestion for 13 keys

Total is 13 + 12 + 15.5 = 40.5 keys

Sale 12:

https://backpack.tf/profiles/76561198429029268#!/compare/1533600000/1533686400

https://backpack.tf/profiles/76561198439812057#!/compare/1533600000/1533686400

Sold for Neutron Deep Cover(41) + ~4 keys in sweets

Total is 45 keys.

Sale 13:

https://backpack.tf/profiles/76561198439812057#!/compare/1533600000/1533686400

https://backpack.tf/profiles/76561198085785769#!/compare/1533686400/1533772800

Sold for Tesla Ze Goggles(40)

Total sales @:

33, 33, 33.5, 34, 36, 37, 40, 40.5, 45, 46.5

https://i.imgur.com/HeijEFh.png

Buyers up to 26 keys,

Sellers down to 35 keys, unsolds for months at 39, 40

https://backpack.tf/item/5375428036

https://backpack.tf/item/1551956599

https://backpack.tf/item/1593508185

https://backpack.tf/item/6375759470

https://backpack.tf/item/5382108799

Lets take 33 - 34 keys, ignoring all other sales by gambling that the current 35 sellers won't sell for a while.

However, it should be discussed whether or not such a high amount of higher sales should be ignored because of current sellers.