Hmm

Sales 1 - 5) Sales at $54.99, $54.90, $55, $54.99, $55

https://marketplace.tf/items/30570;5;u3006

Keys were ~$1.96, ~$1.96, $1.96, $1.93, $1.94 at the times the sales occurred. These sales are all 28 Keys.

https://backpack.tf/item/3292160404

Sale 6) Sold for 15 Keys + 8 Refined

https://backpack.tf/profiles/76561198117279783#!/compare/1523750400/1524268800

https://backpack.tf/item/3281368054

Sale 7) Sold for an Australium Eyelander (28 Keys)

https://backpack.tf/profiles/76561198054945991#!/compare/1526169600/1526256000

https://backpack.tf/item/3271422995

Sale 8) Sold for a Haunted Phantasm Jr Skullcracker + Ghastly Ghosts Jr Party Trick + ~4 Keys of Items

https://backpack.tf/profiles/76561198152450763#!/compare/1524182400/1524268800

Ew.

https://backpack.tf/item/3292160404 and https://backpack.tf/item/3387518407

Sales 9 - 13) Bought by bots for 15 Keys + 3 Refined and 15 Keys + 8 Refined (twice, one of the times was Sale 6). Sold by bots for 18 Keys three times.

https://cdn.discordapp.com/attachments/298073323219320834/457044370349096961/unknown.png

Calling 18 low because the sales happened in 2-4 days and are fairly old.