Sale 1:

https://backpack.tf/profiles/76561198856746431#!/compare/1568160000/1568419200

https://backpack.tf/profiles/76561198026012936#!/compare/1568332800/1568419200

Sold for Stormy Nickel + negligible sweets

based on current sellers, low.

https://bot.tf/stats/listings/Y9G7O6JN

B/O of 20 keys

Sale 2:

https://backpack.tf/profiles/76561198026012936#!/compare/1568332800/1568419200

https://backpack.tf/profiles/76561198103684583#!/compare/1568332800/1568419200

Sold with negligible sweets for Stormy Tough Stuff

Stuff Mini:

https://backpack.tf/suggestion/5da0075fd381722b6d3f2f19

Suggestion for 23.5 keys

total is 23 keys

Sale 3:

https://backpack.tf/profiles/76561198103684583#!/compare/1568419200/1568505600

https://backpack.tf/profiles/76561198004952793#!/compare/1568419200/1568505600

Sold with 3 keys for MG Metal Slug

Slug Mini:

https://backpack.tf/suggestion/5da00df6d3817230fb25fe68

Suggestion for 31 keys

Total is 28 keys

https://bot.tf/stats/listings/M0D51Q22

B/O of 31 keys

Sale 4:

https://marketplace.tf/items/tf2/30054;5;u16

$69.99 / $1.82 = 38.46 keys

https://backpack.tf/item/7472159275

Total sales @:

23, 28, 38.46 keys

calling 38 the outlier,

taking 23 - 28 keys.