Sale 1:

Sold for 15 keys + ~3 keys in items (one of the items being a spec. ks medigun kit, shown in the buyer’s side)

http://www.tf2outpost.com/trade/29391198 - B/O of 18

Seller: https://backpack.tf/profiles/76561198284701656#!/compare/1507334400/1507420800

Buyer: https://backpack.tf/profiles/76561198099200059#!/compare/1507334400/1507420800

X = 18

Sale 2:

Sold for 18 keys (IDs match)

http://www.tf2outpost.com/trade/29373612 - B/O of 18

Seller: https://backpack.tf/profiles/76561198058640870#!/compare/1507161600/1507248000

Buyer: https://backpack.tf/profiles/76561198075599870#!/compare/1507248000/1507334400

X = 18

Sale 3:

Sold for Planets Glengarry (Outdated at 11) + 7 keys

http://www.tf2outpost.com/trade/29363855 - B/O of 16

Seller: https://backpack.tf/profiles/76561198232041512#!/compare/1504915200/1505001600

Buyer: https://backpack.tf/profiles/76561198068351675#!/compare/1504915200/1505001600

Will easily reach at least 16 keys.

X = 16

Sale 4:

Quicksold for 15 keys

http://www.tf2outpost.com/trade/29396288 - B/O of 15

Seller: https://backpack.tf/profiles/76561198049973071#!/compare/1507420800/1507766400

Buyer: https://backpack.tf/profiles/76561198401958573#!/compare/1507680000/1507766400

X = 15

Sale 5:

Sold for Orbiting Fire Football Helmet (Outdated at 8.5) + 6 keys + < 0.5 keys in items

Seller: https://backpack.tf/profiles/76561198158482500#!/compare/1505952000/1506038400

Buyer: https://backpack.tf/profiles/76561198067557593#!/compare/1505952000/1506038400

Looking at the seller’s end, a ~2.5 key item may have also been added, then re-sold on the day. Either way, this sale will either get countered by the quicksale at 15, or will fall into the range.

Sale 6:

Sold with some keys/items for Stormy Voodoo JuJu

Seller: https://backpack.tf/profiles/76561198099200059#!/compare/1507680000/1507766400

Buyer: https://backpack.tf/profiles/76561198049973071#!/compare/1507420800/1507766400

Should be used on the JuJu.

Sale 7:

Sold with a key for Nuts n Bolts Dapper Topper

Seller: https://backpack.tf/profiles/76561198068351675#!/compare/1505001600/1505174400

Buyer: https://backpack.tf/profiles/76561198058640870#!/compare/1505088000/1505174400

Can be used on the Dapper Topper.

Sale 8:

Sold with a key for Kill-a-Watt Desert Marauder

Seller: https://backpack.tf/profiles/76561198288884172#!/compare/1505865600/1505952000

Buyer: https://backpack.tf/profiles/76561198158482500#!/compare/1505865600/1505952000

Should be used on the Marauder.

Sellers:

19 keys:

https://i.imgur.com/sZ5HI4W.png – 3 months

https://i.imgur.com/qEdh5DM.png - 19 days

https://i.imgur.com/W11GET1.png - 13 days

Sales at:

15

16

18 (2x)

15 quicksold, excluding 15.

Going with 16-18.