https://marketplace.tf/items/tf2/463;5;u3020

Jan 29 - $29.99

Feb 3 - $12.30, buy order

Feb 28 - $15.10, not buy order but very close to them = 9 keys

Buy orders: $11-12.36

https://gyazo.com/7a31816fab301c1d083dc7e7e16b0b7a

Approximately 6.5-7.3 keys

https://gyazo.com/6447dfbadaa20c40c1161c0ee5e39981

Buyers on classifieds at 8.4

https://backpack.tf/item/1125545738

https://backpack.tf/item/352491327

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https://backpack.tf/profiles/76561198340634356#!/compare/1579478400/1579564800

https://backpack.tf/profiles/76561198272089853#!/compare/1579305600/1579564800

11 keys, near id 8442694722 in first compare link

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https://backpack.tf/profiles/76561198841279602#!/compare/1581724800/1581811200

https://backpack.tf/profiles/76561197988341178#!/compare/1581724800/1581811200

Might be 6 keys, unlikely though since it's a bot selling it

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https://backpack.tf/profiles/76561197988341178#!/compare/1581984000/1582070400

https://backpack.tf/profiles/76561198314211872#!/compare/1581984000/1582070400

Untraceable, keys were used in the same day

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Sellers:

https://gyazo.com/51fe1337fd66ee557d51bcb0414072bf

https://backpack.tf/item/352491327

14 keys for 4 days

https://marketplace.tf/items/tf2/463;5;u3020

https://gyazo.com/44f937453a244d9c3196fdb50d343cc6

$27.13, $27.40, approximately 16 keys

Going to exclude the $29.99 sale and go with 9-11 keys