Trade 1

https://backpack.tf/item/4728215792

https://backpack.tf/profiles/76561197960510952#!/compare/1597017600/1597104000

https://backpack.tf/profiles/76561198057452720#!/compare/1596844800/1597017600

Bulk Trades, hard to tell what was traded here.

Trade 2

https://backpack.tf/item/4497157251

https://backpack.tf/profiles/76561198209640976#!/compare/1599264000/1599350400

https://backpack.tf/profiles/76561197998632922#!/compare/1599264000/1599350400

Bulk, I guess 110 Keys ?

Using this as the low end

Trade 3

https://backpack.tf/item/4035320029

That one is mine.

Sold on September 27th for 322 $

Keys Price at 1.88 $

322$/ 1.88$ = 171.27 = 171 Keys

The seller listed the B/O as 155 Keys. (OddFuture)

https://prnt.sc/uouwy9

Using 155 as the high end.

Trade 4

https://backpack.tf/item/1893338904

https://backpack.tf/profiles/76561198050702987#!/compare/1599091200/1600905600

The item was changed on said date, not traded.

The owner probably applied the stragifier to it.

https://marketplace.tf/items/tf2/451;5;u61;strange

The other sales are outdated.