Sale 1:

https://backpack.tf/profiles/76561198067946118#!/compare/1589673600/1589760000

https://backpack.tf/profiles/76561198049313139#!/compare/1589760000/1589846400

untrace

sale 2:

https://backpack.tf/profiles/76561198049313139#!/compare/1590278400/1590364800

https://backpack.tf/profiles/76561198340434037#!/compare/1590192000/1590278400

Bulk for DP KE

sale 3:

https://backpack.tf/profiles/76561198340434037#!/compare/1590278400/1590364800

https://backpack.tf/profiles/76561198317571803#!/compare/1590278400/1590364800

Can trace sweets, low

Sale 4:

https://backpack.tf/profiles/76561198317571803#!/compare/1590278400/1590364800

https://backpack.tf/profiles/76561198010901864#!/compare/1590278400/1590364800

Sold for ~10 keys

sale 5:

https://backpack.tf/profiles/76561198010901864#!/compare/1590278400/1590364800

https://backpack.tf/profiles/76561198052194031#!/compare/1590278400/1590364800

Sold for ~11 keys

sale 6:

https://backpack.tf/profiles/76561198052194031#!/compare/1590278400/1590364800

https://backpack.tf/profiles/76561198873106287#!/compare/1561075200/1590364800

compares above are sale, compares below are supplemental to prove sale:

https://backpack.tf/profiles/76561198980897882#!/compare/1590019200/1590364800

https://backpack.tf/profiles/76561198101915413#!/compare/1590278400/1590364800

Sold for Bubbling Outdoorsman + ~5 keys in sweets

Outdoor Mini:

https://backpack.tf/suggestion/5f2ba8430b2c2f062524b463

Suggestion for 7 keys

Total is 12 keys

sale 7:

https://backpack.tf/profiles/76561198873106287#!/compare/1590624000/1596672000

https://backpack.tf/profiles/76561198223881088#!/compare/1590537600/1590624000

Untrace

sale 8:

https://backpack.tf/profiles/76561198223881088#!/compare/1592524800/1592611200

https://backpack.tf/profiles/76561198251713434#!/compare/1592524800/1592784000

Sold with ~8 keys in sweets for Isotope Cabin FT RL(27.5)

Total is 19.5 keys

sale 9:

https://backpack.tf/profiles/76561198251713434#!/compare/1593216000/1594339200

https://backpack.tf/profiles/76561198208165271#!/compare/1593475200/1593648000

untrace

sale 10:

https://backpack.tf/profiles/76561198120915268#!/compare/1593907200/1596672000

https://backpack.tf/profiles/76561198341171690#!/compare/1595462400/1595635200

QS

sale 11:

https://backpack.tf/profiles/76561198341171690#!/compare/1596499200/1596585600

https://backpack.tf/profiles/76561198168946002#!/compare/1596153600/1596585600

Sold for ~11 keys

sale 12:

https://backpack.tf/profiles/76561198296253816#!/compare/1591228800/1596240000

https://backpack.tf/profiles/76561198869030126#!/compare/1576281600/1596240000

Tradeback?

sale 13:

https://backpack.tf/profiles/76561198050518375#!/compare/1592006400/1592092800

https://backpack.tf/profiles/76561198850274253#!/compare/1592006400/1592092800

Untrace

sale 14:

https://marketplace.tf/items/tf2/135;5;u34

$31 / $1.93 = 16.06 keys

Sale 15:

https://backpack.tf/profiles/76561198036919909#!/compare/1590624000/1594684800

https://backpack.tf/profiles/76561199048087430#!/compare/1596067200/1596240000

Untrace

sale 16:

https://backpack.tf/profiles/76561199048087430#!/compare/1596240000/1596672000

https://backpack.tf/profiles/76561198096621282#!/compare/1596326400/1596412800

Untrace

Total sales @:

10, 11, 11, 12, 16, 20 keys

https://i.imgur.com/XXH9b5p.png

https://i.imgur.com/ESE3456.png

buyers up to ~10.7 keys,

seller for ~12 keys is new,

Johan has had the hat since June 14:

https://backpack.tf/item/632260913

but can't prove that it's been listed for ~11 keys since then...

given the 2 sellers, however, i doubt 16+ is accurate.

taking 11 - 12 keys.