Using last month.

Sales 1-5:

Sold for $19, $14.87, $14.50, $14, and $10 on marketplace.tf.

https://marketplace.tf/items/30762;5;u3005

19/1.94 = ~9.79

14.87/1.96 = ~7.59

14.50/1.96 = ~7.4

14/1.99 = ~7.04

10/1.95 = ~5.13

X = 10

X = 7.5 (2x)

X = 7

X = 5

Sale 6:

Sold for 5 keys + 34 ref?

Seller: https://backpack.tf/profiles/76561198305676157#!/compare/1531699200/1531785600

Buyer: https://backpack.tf/profiles/76561198371792104#!/compare/1531699200/1531872000

Only 5 keys and 14 ref are traceable, though I don’t doubt that bot.tf is correct here. https://i.imgur.com/Wjy8Y36.png

X = 6

Sale 7:

Sold for 6 keys

Seller: https://backpack.tf/profiles/76561198382589541#!/compare/1531353600/1531440000

Buyer: https://backpack.tf/profiles/76561198118150950#!/compare/1531353600/1531440000

Bot.tf kinda confirms: https://i.imgur.com/Wjy8Y36.png

X = 6

Sale 8:

Sold to a bot for 5 keys + 10 ref?

Seller: https://backpack.tf/profiles/76561198254601177#!/compare/1531872000/1532044800

Buyer: https://backpack.tf/profiles/76561198305676157#!/compare/1531785600/1531872000

Untraceable. Bot.tf confirms, but it is unreliable. https://i.imgur.com/Wjy8Y36.png

X = 5.5?

Sale 9:

Sold for 5 keys + 18 ref?

Seller: https://backpack.tf/profiles/76561198312583107#!/compare/1531699200/1531785600

Buyer: https://backpack.tf/profiles/76561198060970000#!/compare/1530748800/1531785600

Untraceable. Bot.tf confirms, but it is unreliable. https://i.imgur.com/Wjy8Y36.png

X = 5.5?

Sale 10:

Sold to a bot for 5 keys?

Seller: https://backpack.tf/profiles/76561198302934639#!/compare/1531267200/1531958400

Buyer: https://backpack.tf/profiles/76561198312583107#!/compare/1531180800/1531267200

Untraceable. Bot.tf confirms, but it is unreliable. https://i.imgur.com/Wjy8Y36.png

X = 5?

Sale 11:

Bulk for Orbiting Fire Galvanized Gibus

Seller: https://backpack.tf/profiles/76561198093617997#!/compare/1531353600/1531872000

Buyer: https://backpack.tf/profiles/76561198086793593#!/compare/1531440000/1531699200

Sale 12:

Bulk for keys

Seller: https://backpack.tf/profiles/76561198258558388#!/compare/1529798400/1530144000

Buyer: https://backpack.tf/profiles/76561198011321852#!/compare/1530144000/1530230400

Sellers:

~6.05 keys:

https://i.imgur.com/ngUF4lD.png

https://backpack.tf/item/5399082763

https://backpack.tf/item/5391559192

11 keys:

https://i.imgur.com/MUzq5JU.png

https://backpack.tf/item/6390811166

~11.6 keys:

https://i.imgur.com/PPTligp.png

https://backpack.tf/item/6836951240

https://backpack.tf/item/5954539764

Sales at:

5

6 (2x)

7

7.5 (2x)

10

10 is an outlier, exluding.

Was originally going to go with 6 flat, excluding the sales higher than the 2 sellers, and excluding the sale that will match the buyer at 5, but this thing needs a range. Will give it the same median, however.

Going with 5-7.

https://backpack.tf/profiles/76561198391276400#!/compare/1533081600/1533168000

https://backpack.tf/profiles/76561198305676157#!/compare/1533081600/1533168000

untraceable

https://backpack.tf/profiles/76561198305676157#!/compare/1532822400/1532908800

https://backpack.tf/profiles/76561198453535254#!/compare/1532908800/1533081600

6 keys + 4 ref

https://backpack.tf/profiles/76561198515764827#!/compare/1532995200/1533081600

https://backpack.tf/profiles/76561198075610620#!/compare/1532995200/1533081600

6 keys + 1.33 ref

fits in the range.