Using last month

Sale 1:

Bot.tf sale at 7 keys

https://i.imgur.com/xpZrj7C.png

Seller: https://backpack.tf/profiles/76561198344933095#!/compare/1523664000/1523750400

Buyer: https://backpack.tf/profiles/76561198412292295#!/compare/1523664000/1523750400

X = 7

Sale 2:

Sold for $10 on Marketplace.tf

https://marketplace.tf/items/477;5;u3008

Can’t find item’s history

10/1.97 = ~5.08

X = 5

Sale 3:

Sold for ~4 keys in items

Seller: https://backpack.tf/profiles/76561198412292295#!/compare/1523750400/1523836800

Buyer: https://backpack.tf/profiles/76561198153806405#!/compare/1523664000/1523750400

X = 4

Sale :

Bulk for pure

Seller: https://backpack.tf/profiles/76561198259342040#!/compare/1521676800/1521763200

Buyer: https://backpack.tf/profiles/76561198808482503#!/compare/1521590400/1521763200

Sellers:

~6.55 keys:

https://i.imgur.com/h30q9BP.png

https://backpack.tf/item/4837848730

7 keys:

https://i.imgur.com/ED5IvI9.png

https://backpack.tf/item/2310766322

https://i.imgur.com/6OWgQDU.png

https://backpack.tf/item/6512155344

https://i.imgur.com/erkiI3K.png

https://backpack.tf/item/4455187261

8 keys:

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

https://backpack.tf/item/5972741585

12 keys:

https://i.imgur.com/WJozYo8.png

https://backpack.tf/item/4039124492

SCM: (Taking keys as $2.47)

https://i.imgur.com/fn2soCg.png (only the first 5 are relevant)

$15.15 (~6.13 keys)

$15.26 (~6.18 keys)

$15.35 (~6.21 keys)

$17.89 (~7.24 keys)

$17.89 (~7.24 keys)

Sales at:

4

5

7

https://i.imgur.com/fKcwpjY.png - Buyers at 5 keys, excluding 4 and 5.

3 sellers on the SCM for ~6 keys, using that as the low-end.

Going with 6-7.