Victory Skeek

https://backpack.tf/item/7183771547

Sale 1) Sold for 9 Keys

https://backpack.tf/profiles/76561198084530972#!/compare/1546041600/1546128000

https://backpack.tf/item/6691334159

Sale 2) Sold for 3 Keys + 21 Refined

https://backpack.tf/profiles/76561198039281151#!/compare/1548892800/1549238400

Low outlier.

Sale 3) Sold for 4 Keys

https://backpack.tf/profiles/76561198334598690#!/compare/1550016000/1550102400

Low outlier.

Sale 4) ?

https://backpack.tf/profiles/76561198269104470#!/compare/1550102400/1550188800

https://backpack.tf/profiles/76561198870470574#!/compare/NaN/1550102400

https://backpack.tf/item/6484029020

Sale 5) Sold for 8 Keys

https://backpack.tf/profiles/76561198335791307#!/compare/1550102400/1550188800

https://backpack.tf/item/6136294920

Sale 6) Bulk sale for a Poisonous Bubbles Conga

https://backpack.tf/profiles/76561198344316001#!/compare/1548115200/1548288000

Sale 7) Quicksold for 8 Keys

https://backpack.tf/profiles/76561198271997758#!/compare/1548201600/1548288000

https://backpack.tf/item/5386549639

Sale 8) Sold for 3 Keys

https://backpack.tf/profiles/76561198373719952#!/compare/1547251200/1547337600

Low outlier.

https://backpack.tf/item/5103780745

Sale 9) Sold for 7 Keys

https://backpack.tf/profiles/76561198049451980#!/compare/1546819200/1547078400

https://backpack.tf/profiles/76561198814345631#!/compare/1546732800/1546905600

Sale 10) Quicksold for 7 Keys + 8 Refined

https://backpack.tf/profiles/76561198814345631#!/compare/1546905600/1546992000

Rounds to 7 Keys

https://backpack.tf/item/6829908302

Sale 11) Sold for 7 Keys

https://backpack.tf/profiles/76561198072929068#!/compare/1546905600/1546992000

https://backpack.tf/profiles/76561198070652981#!/compare/1546819200/1546905600

Sale 12) Quicksold for 7 Keys

https://backpack.tf/profiles/76561198070652981#!/compare/1546905600/1546992000

Sale 13) ?

https://backpack.tf/profiles/76561198819564432#!/compare/1547164800/1547251200

https://backpack.tf/profiles/76561198205566141#!/compare/1547164800/1547251200

Sale 14) Sold for 2 Keys + Spelled Caribbean Conqueror (6.7 Keys)

https://backpack.tf/profiles/76561198205566141#!/compare/1547164800/1547251200

6.7 + 2 = 8.7, which rounds to 8.5 Keys

Caribbean Mini

https://backpack.tf/profiles/76561198298979151#!/compare/1547424000/1547510400 - Sold for ~4.7 Keys of Items + 2 Keys

Sale 15) Quicksold for 7 Keys + 8.11 Refined

https://backpack.tf/profiles/76561198209640976#!/compare/1547164800/1547251200

Rounds to 7 Keys

https://marketplace.tf/items/30761;5;u3003 - Sold for $17 twice, $8.72 (low), $16.99 and $17, $18, $13.5, and $17

Keys were $1.79 x2, $1.76 for the low sale, $1.77 x2, $1.76, $1.80, and $1.80, respectively.

https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key

That makes the sales 9.5 Keys x2, 9.6 Keys x2 (which rounds to 9.5 Keys), 10.2 Keys, 7.5 Keys, and 9.4 Keys.

Calling 10.2 Keys high.