History 1 (SPEC KS): https://backpack.tf/item/3904178425

This appears to be a marketplace.tf sale, but Marketplace.tf doesn't have any records of this item being sold

https://marketplace.tf/items/tf2/208;0;strange;kt-2

History 2: https://backpack.tf/item/3902213905

Sold on Marketplace.tf (September 4, all mptf sales down below) https://marketplace.tf/items/tf2/208;0;strange

History 3 (festivized pro KS): https://backpack.tf/item/3901850467

Untrace:

https://backpack.tf/profiles/76561198111548861#!/compare/1594339200/1596153600

https://backpack.tf/profiles/76561198220158797#!/compare/1595462400/1596153600

History 4 (Pro KS): https://backpack.tf/item/3902581999

only 9 keys match, impossible to access bot.tf snapshots because it's a dual quality

https://backpack.tf/profiles/76561198109611180#!/compare/1593561600/1593907200

https://backpack.tf/profiles/76561198281630040#!/compare/1593820800/1593907200

Marketplace.tf sales:

(no KS): https://marketplace.tf/items/tf2/208;0;strange

(Untraceable) June 8 2020: $1.70 (key=$1.98, 85.86 keys) ~86 keys

(Untraceable) July 7 2020: $110.05 (key=$1.98, 55.58 keys) ~56 keys

(Untraceable) July 15 2020: $169.99 (key=$1.99, 85.42 keys) ~85 keys

(History 2) September 4 2020: $145 (key=$1.83, 79.23 keys) ~79 keys

Buy order: $110.05 (key=$1.83, 60.13 keys) excluding 56, leaving us with 79, 85 and 86

Other KS tiers don't have recent sales

Going with 79-86 keys