Resuggestion due to fixed sale, thanks to Mt. Crimson for the info!

Sale 1:

https://backpack.tf/profiles/76561198081270783#!/compare/1566777600/1567036800

https://backpack.tf/profiles/76561197994886526#!/compare/1548720000/1567036800

Transfer

Sale 2:

https://backpack.tf/profiles/76561197994886526#!/compare/1567296000/1567382400

https://backpack.tf/profiles/76561198044027534#!/compare/1567123200/1567296000

sold for 48 keys

Sale 3:

https://backpack.tf/profiles/76561198143843183#!/compare/1565308800/1566086400

https://backpack.tf/profiles/76561198127938353#!/compare/1566000000/1566086400

QS

Sale 4:

https://backpack.tf/profiles/76561198127938353#!/compare/1567296000/1567382400

https://backpack.tf/profiles/76561198112412669#!/compare/1567296000/1567382400

Sold with ~2 keys in sweets for Scorching Warhood(63.5)

total is 61.5 keys

sale 5:

https://backpack.tf/profiles/76561198112412669#!/compare/1567555200/1567728000

https://backpack.tf/profiles/76561198095022965#!/compare/1567641600/1567728000

Sold for 36 keys

sale 6:

https://backpack.tf/profiles/76561198095022965#!/compare/1568246400/1568332800

https://backpack.tf/profiles/76561198075452291#!/compare/1568246400/1568332800

Sold for PE Vampire + C9 Kiss King + 3 keys

Vampire Mini:

https://backpack.tf/suggestion/5dcba7ca67807239210632c7

Suggestion for 31 keys

King Mini:

https://backpack.tf/suggestion/5dcfb4dad381721dc405e783

Suggestion for 21.5 keys

Total is 55.5 keys

Caps at buyout of 55 keys, here: https://backpack.tf/suggestion/5dcc25add3817238f0705c5e

Sale 7:

https://backpack.tf/profiles/76561198075452291#!/compare/1569024000/1569110400

https://backpack.tf/profiles/76561198068019087#!/compare/1569024000/1569110400

Sold for Scorching Motif(38.5)

sale 8:

https://backpack.tf/profiles/76561198068019087#!/compare/1569715200/1569628800

https://backpack.tf/profiles/76561198031126990#!/compare/1569628800/1569715200

Bulk

sale 9:

https://backpack.tf/profiles/76561198031126990#!/compare/1570492800/1570579200

https://backpack.tf/profiles/76561198129989638#!/compare/1570492800/1570579200

Sold for Vivid Topper + Galactic Trans(10.5) + SGG Schauden(12) + ~2 keys in sweets

ends up high,

Sale 10:

https://backpack.tf/profiles/76561198129989638#!/compare/1570579200/1570665600

https://backpack.tf/profiles/76561198160120451#!/compare/1570492800/1570665600

Bulky

Sale 11:

https://backpack.tf/profiles/76561198076597902#!/compare/1568851200/1568937600

https://backpack.tf/profiles/76561198026129220#!/compare/1568851200/1568937600

QS

Sale 12, 13:

https://marketplace.tf/items/tf2/216;5;u13

$60.1 / $1.82 = 33.02 keys

$94.99 / $1.83 = 51.91 keys <--- https://backpack.tf/item/7955562133

Sale 14:

https://backpack.tf/profiles/76561198026129220#!/compare/1570233600/1572825600

https://backpack.tf/profiles/76561198062611818#!/compare/1572912000/1573171200

Sold for Miami Brass + PE Warming + Hot Ghosts Ft Bomber(35)

nothing solid on the Brass or the Warming, but ends up high.

total sales @:

33, 34, 36, 38.5, 48, 52, 55, 61.5 keys

https://bot.tf/stats/listings/Y9GJKR5W

poorly bumped seller for 50 keys,

buyers up to 38 keys,

let's go with the tight range of 48 - 55 keys, calling a near equal amount of outliers on either side.

Crimson's Part:

https://backpack.tf/suggestion/5dcc25add3817238f0705c5e#comment-5dcc324c6780723b9b161021

Linking previous suggestion for relevant part.