Sale 1:

https://backpack.tf/profiles/76561198305676157#!/compare/1584144000/1584230400

https://backpack.tf/profiles/76561198106784075#!/compare/1584144000/1584230400

Bulk / untrace

sale 2:

https://backpack.tf/profiles/76561198070055287#!/compare/1585094400/1589673600

https://backpack.tf/profiles/76561198133071955#!/compare/1583107200/1588118400

Untrace

sale 3:

https://backpack.tf/profiles/76561198309612194#!/compare/1589673600/1589760000

https://backpack.tf/profiles/76561198046136974#!/compare/1589673600/1590537600

Sold for ~10 keys

sale 4:

https://backpack.tf/profiles/76561198454615761#!/compare/1585440000/1585526400

https://backpack.tf/profiles/76561198849646740#!/compare/1585353600/1585526400

Untrace

sale 5:

https://backpack.tf/profiles/76561198849646740#!/compare/1587600000/1587686400

https://backpack.tf/profiles/76561198057452720#!/compare/1587513600/1587600000

Bulk

sale 6:

https://backpack.tf/profiles/76561198057452720#!/compare/1587600000/1587686400

https://backpack.tf/profiles/76561198314211872#!/compare/1587600000/1587686400

QS

sale 7:

https://backpack.tf/profiles/76561198314211872#!/compare/1587772800/1587859200

https://backpack.tf/profiles/76561198131532406#!/compare/1586217600/1588204800

Untrace

sale 8:

https://backpack.tf/profiles/76561198454615761#!/compare/1584144000/1584230400

https://backpack.tf/profiles/76561198065441328#!/compare/1584230400/1584489600

sold for ~6.5 keys

Sale 9:

https://marketplace.tf/items/tf2/30843;5;u3027

$10 / $1.69 = 5.92 keys <--- https://backpack.tf/item/7345497869

$13.45 / $1.75 = 7.69 keys

$11.95 / $1.80 = 6.64 keys

$13.39 / $1.81 = 7.40 keys

https://backpack.tf/item/8178134679

https://bot.tf/stats/listings/Y9Q6NN00

one of the MPTF sales with a B/O of ~6.5 keys, can't tell which.

Total sales @:

6, 6.5, 6.5, 7.5, 7.5, 10 keys

calling 10 the outlier,

taking 6 - 7.5 keys.