Sale 1:

Sold for $36.99 on Marketplace.tf

https://marketplace.tf/items/50;5;u29

https://backpack.tf/item/1097626785

36.99/2.07 = ~17.9

X = 18

Sale 2:

Sold for Silver Cyclone I See You (In-date at 18, sellers at 15-16, going with 16.5)

No outpost

Seller: https://backpack.tf/profiles/76561198242631690#!/compare/1496534400/1496707200

Buyer: https://backpack.tf/profiles/76561198100064597#!/compare/1496620800/1496707200

ICU sellers: http://i.imgur.com/d0NpfjN.png

X = 17

Sale 3:

Sold for 16 keys + 26 ref (~1)

No B/O’s outpost.

Seller: https://backpack.tf/profiles/76561198011321852#!/compare/1497139200/1497225600

Buyer: https://backpack.tf/profiles/76561198219234573#!/compare/1497139200/1497225600

X = 17

Sale 4:

Sold for Searing Plasma Geisha Boy (15) (and a reclaimed metal)

No outpost

Seller: https://backpack.tf/profiles/76561198324836304#!/compare/1495670400/1495756800

Buyer: https://backpack.tf/profiles/76561198328390406#!/compare/1495670400/1495756800

X = 15

Sale 5:

Sold for 14 keys

http://www.tf2outpost.com/trade/29199419 - B/O of 14

Seller: https://backpack.tf/profiles/76561198149175706#!/compare/1496448000/1496534400

Buyer: https://backpack.tf/profiles/76561198062948873#!/compare/1495929600/1496534400

X = 14

Sale 6:

Sold for 14 keys + 8 ref

http://www.tf2outpost.com/trade/29200542 - B/O of 15

Seller: https://backpack.tf/profiles/76561198078552523#!/compare/1495843200/1495929600

Buyer: https://backpack.tf/profiles/76561198150783829#!/compare/1495843200/1495929600

X = 14

Sale 7:

Sold in ~2-3 days for 13 keys

Seller: https://backpack.tf/profiles/76561198197287330#!/compare/1495584000/1495670400

Buyer: https://backpack.tf/profiles/76561198149175706#!/compare/1495584000/1495670400

X = 13

Sale 8:

Sold for Pro. KS AWP (11.5)

No outpost

Seller: https://backpack.tf/profiles/76561198182323073#!/compare/1495324800/1495497600

Buyer: https://backpack.tf/profiles/76561198515764827#!/compare/1495411200/1495497600

X = 11.5

Sale 9:

Sold with >4.5 keys in pure/items for Insomnia Birdcage

Seller: https://backpack.tf/profiles/76561198165396407#!/compare/1496966400/1497052800

Buyer: https://backpack.tf/profiles/76561198074181476#!/compare/1496880000/1496966400

Should be used on the Birdcage.

Sale 10:

Sold for Smoking German Gonzila?

Seller: https://backpack.tf/profiles/76561198026129220#!/compare/1493942400/1494028800

Buyer: https://backpack.tf/profiles/76561198182323073#!/compare/1493337600/1494028800

Can almost guarantee that non-TF2 items were added. Excluding this sale.

Sale 11:

Bulk for Cloud 9 Honchos

Seller: https://backpack.tf/profiles/76561198138611987#!/compare/1495238400/1495411200

Buyer: https://backpack.tf/profiles/76561198197287330#!/compare/1495324800/1495411200

Sellers:

$30 – Marketplace.tf (~14.5 keys)

https://marketplace.tf/partneritem?sku=50;5;u29&attrib=bp

Sales at:

11.5

13

14 (2x)

15

17 (2x)

18

Buyer at >11.5:

http://i.imgur.com/DELXAcr.png

Excluding 11.5 (was the reason I didn’t round the sale)

13 sold in a short amount of time. Excluding 13.

Going with 14-18.