Sale 1:

https://backpack.tf/profiles/76561197961208148#!/compare/1545436800/1545782400

https://backpack.tf/profiles/76561198093983826#!/compare/1545177600/1545523200

Untrace

Sale 2:

https://backpack.tf/profiles/76561198262713274#!/compare/1546732800/1546819200

https://backpack.tf/profiles/76561198335791307#!/compare/1546732800/1546819200

Sold for 16 keys

Sale 3:

https://backpack.tf/profiles/76561198093983826#!/compare/1546819200/1546992000

https://backpack.tf/profiles/76561198262713274#!/compare/1546732800/1546819200

Untrace

Sale 4:

https://backpack.tf/profiles/76561198006295346#!/compare/1546041600/1546128000

https://backpack.tf/profiles/76561198021055079#!/compare/1545955200/1546128000

Sold for ~16 keys

Sale 5:

https://backpack.tf/profiles/76561198298979151#!/compare/1544918400/1545696000

https://backpack.tf/profiles/76561198265550041#!/compare/1544659200/1545523200

https://backpack.tf/profiles/76561198298979151#!/compare/1545696000/1547337600

Tradebacks

Sale 6:

https://backpack.tf/profiles/76561198298979151#!/compare/1547337600/1547424000

https://backpack.tf/profiles/76561198040726528#!/compare/1547251200/1547337600\

Bulk

Sale 7:

https://backpack.tf/profiles/76561198040726528#!/compare/1547510400/1547596800

https://backpack.tf/profiles/76561198114402400#!/compare/1547510400/1547596800

Bulk

Sale 8:

https://backpack.tf/profiles/76561198022071751#!/compare/1545955200/1546128000

https://backpack.tf/profiles/76561198002492237#!/compare/1546041600/1546128000

Untrace

Sale 9:

https://backpack.tf/profiles/76561198006295346#!/compare/1550793600/1550880000

https://backpack.tf/profiles/76561198126893981#!/compare/1551312000/1552003200

Bulk / untrace

Sale 10:

https://backpack.tf/profiles/76561198185148093#!/compare/1550275200/1550707200

https://backpack.tf/profiles/76561198379886287#!/compare/1550707200/1551052800

https://backpack.tf/profiles/76561198185148093#!/compare/1550707200/1550793600

Transfers

Sale 11:

https://backpack.tf/profiles/76561198185148093#!/compare/1550707200/1550793600

https://backpack.tf/profiles/76561198305676157#!/compare/1550707200/1550793600

Sold for 16 keys

Sale 12, 13:

https://marketplace.tf/items/1172;5;u3017

$35.00 / $1.77 = 19.77 keys

$49.99 / $1.79 = 27.93 keys

Total sales @:

16, 16, 16, 19.77, 27.93 keys

Sellers down to 22 keys,

Buyers up to 16 keys,

Lower sales point to 27.93 being high,

going with 20 flat.