Re-suggestion, thanks to Mindacos for the info!

Sale 1:

https://backpack.tf/profiles/76561197994697258#!/compare/1522713600/1522800000

https://backpack.tf/profiles/76561198079631972#!/compare/1522713600/1522800000

Sold for Tiger Strongarm + 13 keys + 5.31 keys in sweets

Strongarm Mini:

https://marketplace.tf/items/30844;5;u3006

2 Sales at 30.49 & 29.50 USD

Keys at 1.97 & 1.97

Totals are 15.48 & 14.97 keys

Taking 15 flat.

Total is 33.31 keys

http://www.tf2outpost.com/trade/29565445

B/O of 30, capping.

Sale 2:

https://backpack.tf/profiles/76561198122604075#!/compare/1523491200/1523577600

https://backpack.tf/profiles/76561198199491958#!/compare/1523404800/1523577600

Sold for 16 keys + TFL Spartan

Spartan Mini:

https://backpack.tf/profiles/76561198252999692#!/compare/1523145600/1523318400

Sold for 15 keys + 18 ref

Taking 16 flat.

Total is 32 keys.

http://www.tf2outpost.com/trade/29613678

B/O of 40.

Sale 3:

https://backpack.tf/profiles/76561198199491958#!/compare/1523664000/1523750400

https://backpack.tf/profiles/76561198314917034#!/compare/1523577600/1523664000

Sold for Searing Fly Guy

Fly Guy mini:

https://backpack.tf/profiles/76561198048563101#!/compare/1526860800/1526947200

Sold for 18 pure.

https://backpack.tf/profiles/76561198200746046#!/compare/1526256000/1526342400

Sold for 21 pure.

Sellers for 16.

Taking 16 - 21 keys, average of 18.5 keys.

Sale 4:

https://backpack.tf/profiles/76561198314917034#!/compare/1524787200/1524873600

https://backpack.tf/profiles/76561198232041512#!/compare/1524787200/1524873600

Sold with 4.19 keys in sweets for Misty Football(32)

Total is 27.81 keys.

Sale 5:

https://backpack.tf/profiles/76561198232041512#!/compare/1526342400/1526428800

https://backpack.tf/profiles/76561198131986842#!/compare/1526342400/1526428800

Sold for D@D Bombing Run(28.5)

Sale 6:

https://backpack.tf/profiles/76561198131986842#!/compare/1526774400/1526860800

https://backpack.tf/profiles/76561198195734346#!/compare/1526774400/1526860800

Sold for 22 keys (6 were used to buy Aussie Blutsauger)

Sale 7:

https://backpack.tf/profiles/76561198195734346#!/compare/1526947200/1527033600

https://backpack.tf/profiles/76561198232041512#!/compare/1526947200/1527033600

Bulk.

https://i.imgur.com/b5iZQDC.jpg

Buyers up to 22.

Seller at 28.

Total sales @:

18.5, 22, 27.81, 28.5 30, 32

Considering seller, taking 28 - 30 keys,.

Mindacos' part:

Both the D@D bombing run(sellers at 26) and the misty skull football helmet(30 keys - 4 = 26 keys) sales suggest that this needs a low end that's lower than 28, with the possibility of calling 32 an outlier also.

If you can't use either of those sales, this will likely be left up for a month, however either one of these two unusuals will need to be looked at. I'll leave it up to you which one you're going to use for the low end here.