Sale 1:

https://backpack.tf/profiles/76561198079719201#!/compare/1566777600/1567641600

https://backpack.tf/profiles/76561198086948995#!/compare/1566691200/1566777600

Sold with ~2.5 keys in sweets for FoD Arms Race

would be low by sellers on the Arms Race

Sale 2:

https://backpack.tf/profiles/76561198110409052#!/compare/1566950400/1567641600

https://backpack.tf/profiles/76561198002757046#!/compare/1567555200/1567641600

QS

sale 3:

https://backpack.tf/profiles/76561198091334514#!/compare/1566172800/1566950400

https://backpack.tf/profiles/76561198323565601#!/compare/1566086400/1566172800

sold for 6 keys (QS)

Sale 4:

https://backpack.tf/profiles/76561198312410247#!/compare/1567296000/1567468800

https://backpack.tf/profiles/76561198061440669#!/compare/1567209600/1567296000

Bulk

sale 5:

https://backpack.tf/profiles/76561198053399320#!/compare/1555977600/1565913600

https://backpack.tf/profiles/76561198859307496#!/compare/1570060800/1571616000

Untrace

sale 6:

https://backpack.tf/profiles/76561198232721912#!/compare/1564358400/1566172800

https://backpack.tf/profiles/76561198167416267#!/compare/1566172800/1566259200

QS

sale 7:

https://backpack.tf/profiles/76561198167416267#!/compare/1567382400/1567468800

https://backpack.tf/profiles/76561198035746146#!/compare/1566000000/1567814400

Untrace

sale 8:

https://backpack.tf/profiles/76561198280637226#!/compare/1560556800/1566345600

https://backpack.tf/profiles/76561198068460782#!/compare/1566259200/1566345600

Sold whit 2 keys for KaW Western

Western Mini:

https://backpack.tf/suggestion/5daf82d6d381723aac622810

Suggestion for 9.75 keys

Total is 7.75 keys

Sale 9:

https://backpack.tf/profiles/76561198068460782#!/compare/1566259200/1566345600

https://backpack.tf/profiles/76561198169756327#!/compare/1566259200/1566345600

Sold for Bubbling Mirror(8.5) + negligible sweets

Total is ~8.5 keys still

https://bot.tf/stats/listings/4JGJ1P5P

B/O of 11 keys

sale 10:

https://backpack.tf/profiles/76561198169756327#!/compare/1566259200/1566345600

https://backpack.tf/profiles/76561198102296925#!/compare/1566259200/1566345600

Untrace

sale 11:

https://backpack.tf/profiles/76561198059797730#!/compare/1566518400/1566604800

https://backpack.tf/profiles/76561198101300189#!/compare/1566432000/1566518400

untrace

Sale 12:

https://backpack.tf/profiles/76561198045146974#!/compare/1567900800/1567987200

https://backpack.tf/profiles/76561198084253479#!/compare/1567900800/1567987200

Untrace

Sale 13:

https://backpack.tf/profiles/76561198084253479#!/compare/1567900800/1567987200

https://backpack.tf/profiles/76561198036117309#!/compare/1567900800/1568073600

Sold with 4 keys for G Fetti Tartan

use there

Sale 14:

https://backpack.tf/profiles/76561198036117309#!/compare/1568073600/1568160000

https://backpack.tf/profiles/76561198928347702#!/compare/1568073600/1568160000

QS?

sale 15:

https://backpack.tf/profiles/76561198928347702#!/compare/1570147200/1570233600

https://backpack.tf/profiles/76561198801509538#!/compare/1570147200/1570492800

Sold for 6 keys

Sale 16:

https://backpack.tf/profiles/76561198801509538#!/compare/1570492800/1570579200

https://backpack.tf/profiles/76561198983921923#!/compare/1570406400/1570579200

Untrace

Sale 17, 18:

https://marketplace.tf/items/tf2/30040;5;u58

$15 / $1.84 = 8.15 keys <--- https://backpack.tf/item/7956280781

$16.94 / $1.81 = 9.36 keys

Total sales @:

6, 7.75, 8.15, 8.5, 9.36 keys

buyers up to ~6 keys,

2 unsolds for ~8 keys, one for ~3 weeks, one for a month.

taking 8 - 8.5 keys, calling 9.5 the outlier.