Resuggestion, thanks to Xergoyf for the info!

Sale 1:

https://backpack.tf/profiles/76561198400562713#!/compare/1590278400/1590537600

https://backpack.tf/profiles/76561198055622215#!/compare/1590451200/1590537600

Bulk

sale 2:

https://backpack.tf/profiles/76561198055622215#!/compare/1594252800/1594339200

https://backpack.tf/profiles/76561198134058742#!/compare/1594166400/1594339200

Sold for Duped Burning Defiant + 15 keys

Defiant Mini:

https://pastebin.com/7ciPJk6J

Sale for 69 keys

Total is 54 keys

https://bot.tf/stats/listings/466PJVN2

B/O of 80 keys

sale 3:

https://marketplace.tf/items/tf2/309;5;u14;strange

$120 / $1.84 = 65.22 keys

https://backpack.tf/item/930153100

Buyers up to ~56 keys,

Xergoyf’s Part:

In sale 2 the keys were added to the Defiant, so that would be 69 + 15 = 84, capped by the 80 key buyout.

Should note that Sale 2 resold for Sale 3, so he sold it for lower.

https://i.imgur.com/mh9lL5f.jpg

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

Cache shows that it's been listed at least since July 29th, for a higher price, but at some point afterward he lowered the price. This could mean that 65 sold quickly....

https://bot.tf/stats/listings/4KVGKW1E <--- note that he had a B/O lower than what he paid.

https://backpack.tf/profiles/76561198134058742 - judging by his inventory/graph it looks like he was cashing out. He deposited at least a month after buying so it doesn't seem like regret. I agree, a range should be better.

Taking 65 - 80 keys