Sale 1:

Sold for Strange Pro. KS Festive Sniper Rifle (~19)

Seller: https://backpack.tf/profiles/76561198148511293#!/compare/1588118400/1588377600

Buyer: https://backpack.tf/profiles/76561198126834021#!/compare/1588291200/1588377600

https://i.imgur.com/q9bclU6.png - B/O of 20

https://backpack.tf/item/7956079889

19 keys

Sale 2:

Sold for 11 keys

Seller: https://backpack.tf/profiles/76561198080179568#!/compare/1583107200/1583193600

Buyer: https://backpack.tf/profiles/76561198027853670#!/compare/1581033600/1583798400

https://backpack.tf/item/7956064372

11 keys

Other Sales:

https://backpack.tf/item/7956079889 (#1 & #2)

https://backpack.tf/item/7956064372 (#3)

#1

Untraceable, possibly bulk

https://backpack.tf/profiles/76561198453530349#!/compare/1585958400/1586044800

https://backpack.tf/profiles/76561198101977648#!/compare/1585958400/1586044800

Nothing on bot.tf

#2

Untraceable, looks like more bulk

https://backpack.tf/profiles/76561198101977648#!/compare/1586044800/1586131200

https://backpack.tf/profiles/76561198148511293#!/compare/1586044800/1586131200

#3

Untraceable

https://backpack.tf/profiles/76561198878948902#!/compare/1581379200/1581465600

https://backpack.tf/profiles/76561198080179568#!/compare/1581379200/1581465600

Sellers:

https://i.imgur.com/AWBSc55.png

https://backpack.tf/item/7862970703 - 13 keys

Another for <11 keys on scrap:

https://i.imgur.com/MGUaN2X.png

https://backpack.tf/item/7956079889 - pretty recent

Sales at:

11

19

Excluding 19 due to the seller at 13 on the classifieds, the sellers for less than 11 on scrap, and due to the fact that the buyer of the 19 key sale was the one that re-sold to scrap, getting about half of what they paid for the thing.

Taking 11 flat.