Sale 1:

https://backpack.tf/item/7031585038

Not unusual

Sale 2:

https://backpack.tf/item/6254016645

Gambling / tradebacks

Sale 3:

https://backpack.tf/profiles/76561198169109536#!/compare/1552780800/1553126400

https://backpack.tf/profiles/76561198264117106#!/compare/1552953600/1553126400

Bulk

Sale 4:

https://backpack.tf/profiles/76561198240047794#!/compare/1556841600/1557100800

https://backpack.tf/profiles/76561198396322888#!/compare/1557014400/1557100800

QS to bot

Sale 5:

https://backpack.tf/profiles/76561198396322888#!/compare/1557100800/1557187200

https://backpack.tf/profiles/76561198098794519#!/compare/1556928000/1557187200

Keys

Sale 6:

https://backpack.tf/profiles/76561198070262319#!/compare/1554768000/1554940800

https://backpack.tf/profiles/76561198039731024#!/compare/1554854400/1554940800

Bulk

Sale 7:

https://backpack.tf/profiles/76561198111447752#!/compare/1553904000/1557532800

https://backpack.tf/profiles/76561198340634356#!/compare/1557446400/1557532800

Untrace / QS

Sale 8:

https://backpack.tf/profiles/76561198340634356#!/compare/1557964800/1558051200

https://backpack.tf/profiles/76561198859645853#!/compare/1557187200/1558310400

Keys

Sale 9:

https://backpack.tf/item/6269145801

Untrace, through some kind of bot?

Sale 10:

https://backpack.tf/item/6562774134

Not unusual

Sale 11:

https://backpack.tf/profiles/76561198841279602#!/compare/1557532800/1557619200

https://backpack.tf/profiles/76561198417576637#!/compare/1557619200/1557705600

Sold for 5 keys

sale 12:

https://backpack.tf/profiles/76561198335791307#!/compare/1552348800/1552435200

https://backpack.tf/profiles/76561198404115365#!/compare/1552348800/1552435200

Keys, at least 3

Sale 13:

https://backpack.tf/profiles/76561198404115365#!/compare/1554249600/1554336000

https://backpack.tf/profiles/76561198340634356#!/compare/1554249600/1554336000

Untrace

Sale 14:

https://backpack.tf/profiles/76561198340634356#!/compare/1557964800/1558051200

https://backpack.tf/profiles/76561198870621925#!/compare/1557964800/1558137600

https://backpack.tf/profiles/76561198340634356#!/compare/1558051200/1558137600

Tradeback

Bot.tf:

https://bot.tf/stats/item?def=30844&q=5&ef=%2772&craft=1&aus=0&ks=0

Sold:

Past 90 days

1 @ 5 keys

1 @ 3 keys, 42.00 ref

1 @ 5 keys

1 @ 5 keys

Bought:

Past 90 days

1 @ 3 keys, 28.00 ref

1 @ 3 keys, 28.11 ref

1 @ 3 keys, 28.00 ref

1 @ 3 keys, 28.00 ref

MPTF:

https://marketplace.tf/items/30844;5;u3004

$9.87 / $1.81 = 5.45 keys

$11.48 / $1.8 = 6.38 keys (high)

$9.99 / $1.79 = 5.58 keys

$5.33 / $1.78 = 2.99 keys (low)

$9.96 / $1.79 = 5.56 keys

Buyers up to 3.5 keys, only one buyer,

long unsold for 6 keys, one young seller at 5,

gonna take 3.5 - 5.5 keys, buyer shouldn't counter multiple low sales.