sale #1 - https://marketplace.tf/items/tf2/616;5;u62 | https://backpack.tf/item/1895844952

$49 / $1.75 = 28.00 keys

sale #2 - 25 keys

https://backpack.tf/profiles/76561198021055079#!/compare/1583712000/1583798400

https://backpack.tf/profiles/76561198957518408#!/compare/1583712000/1583798400

(rest of https://backpack.tf/item/7955744308 is gambling)

sale #3 - untrace

https://backpack.tf/profiles/76561198080179568#!/compare/1580083200/1580169600

https://backpack.tf/profiles/76561198134546405#!/compare/1579996800/1580083200

(rest of https://backpack.tf/item/7957016115 is gambling)

sale #4 - sold with 2 keys and misc for unusual gl with no mini

https://backpack.tf/profiles/76561198049098788#!/compare/1582070400/1582156800

https://backpack.tf/profiles/76561198802991149#!/compare/1582070400/1582156800

sale #5 - untrace

https://backpack.tf/profiles/76561198049098788#!/compare/1583366400/1583539200

https://backpack.tf/profiles/76561198073175370#!/compare/1583452800/1583539200

(rest of https://backpack.tf/item/7957038317 is gambling)

sale #6 - untrace

https://backpack.tf/profiles/76561198108797381#!/compare/1583798400/1583884800

https://backpack.tf/profiles/76561198035701234#!/compare/1583798400/1583971200

sale #7 - 22 keys

https://backpack.tf/profiles/76561198035701234#!/compare/1583798400/1583971200

https://backpack.tf/profiles/76561198312007577#!/compare/1583884800/1583971200

sale #8 - votext bat hat + steaming stahl + 3k

https://backpack.tf/profiles/76561198088138447#!/compare/1583884800/1583971200

https://backpack.tf/profiles/76561197996411898#!/compare/1583884800/1583971200

bat hat micro - https://marketplace.tf/items/tf2/31058;5;u132

$21.99 / $1.69 = 13.01 keys

$26.99 / $1.70 = 15.88 keys

$26.99 / $1.72 = 15.69 keys

stahl micro - https://marketplace.tf/items/tf2/616;5;u36

$23.99 / $1.79 = 13.40 keys

Taking 30.8 keys here, rounded to 31

sale #9 - bulk

https://backpack.tf/profiles/76561198859721638#!/compare/1585094400/1585180800

https://backpack.tf/profiles/76561197996411898#!/compare/1585094400/1585180800

sale #10 - use there

https://backpack.tf/profiles/76561198859721638#!/compare/1587081600/1587254400

https://backpack.tf/profiles/76561198150875713#!/compare/1587168000/1587254400

sale #11 - 14 - https://marketplace.tf/items/tf2/616;5;u62 | no clue on the histories or b/os

$42.3 / $1.73 = 24.45 keys

$42.99 / $1.78 = 24.15 keys

$42.99 / $1.77 = 24.29 keys

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classi - https://gyazo.com/6628805448c28703aa2e10936f396a1a

Give then sales, ima exclude 31 and 28 to make the range closer to the average sale area and take 22 - 25 keys