Sale 1:

https://backpack.tf/profiles/76561198265536836#!/compare/1528070400/1528156800

Bulk

Sale = N/A

Sale 2:

https://backpack.tf/profiles/76561198096826310#!/compare/1528848000/1528934400

Sold with 1 key for Bubbling Larrikin Robin + Big Kill (7.2 key)

Fits in the range.

Sale 3:

https://backpack.tf/profiles/76561198325528667#!/compare/1528761600/1528848000

https://backpack.tf/profiles/76561198255850609#!/compare/1528675200/1528848000

Sold for Orbiting Fire Toy Soldier + 1 key.

No Mini on the Toy Soldier.

Sale 4:

https://backpack.tf/profiles/76561198273331466#!/compare/1528329600/1528416000

Sold for 20 keys.

High outlier.

Sale 5:

https://backpack.tf/profiles/76561198191920801#!/compare/1528243200/1528329600

Bulk

Sale = N/A

Sale 6:

https://backpack.tf/profiles/76561198131633162#!/compare/1526860800/1526947200

Sold with 3 keys + ~3 keys in sweets for Searing Plasma Airdog

Not really a good sale for either hat.

https://backpack.tf/item/5786106681

Sale 7) Sold for 10 Keys + Mega Strike Soldier's Requiem

https://backpack.tf/profiles/76561198013011182#!/compare/1527984000/1528070400

Fits in the range.

Sale 8) Sold for a Killstreak Australium Grenade Launcher (~14 Keys)

https://backpack.tf/profiles/76561198072014453#!/compare/1529280000/1529452800

Sale 9) Sold for 13 Keys

https://backpack.tf/profiles/76561198287940798#!/compare/1529539200/1529625600

Sale 14) Sold + 8 Keys for a Haunted Ghosts Doctor's Sack

https://backpack.tf/profiles/76561198451665899#!/compare/1529625600/1530316800

http://www.tf2outpost.com/trade/29692095 - Capped by the Buyout of 17 Keys

Sale 15) Quicksold for 13 Keys + 16 Refined

https://backpack.tf/profiles/76561198021191377#!/compare/1530144000/1530316800

Sale 16) Quicksold for 13 Keys + 18 Refined

https://backpack.tf/profiles/76561198254620348#!/compare/1530230400/1530316800

https://imgur.com/a/HBNKRqa - 2 1 Month Unsolds at 18 Keys

https://backpack.tf/item/6864879323

https://backpack.tf/item/6036258598