Sale 1:

https://backpack.tf/profiles/76561198109749673#!/compare/1589673600/1589846400

https://backpack.tf/profiles/76561198056793885#!/compare/1589760000/1589846400

Sold for HG Interface(16)

Sale 2:

https://backpack.tf/profiles/76561198056793885#!/compare/1590796800/1591142400

https://backpack.tf/profiles/76561198879412409#!/compare/1591056000/1591142400

Bulk

sale 3:

https://backpack.tf/profiles/76561198879412409#!/compare/1592352000/1592438400

https://backpack.tf/profiles/76561198271700107#!/compare/1592352000/1592438400

Sold for 11 keys (one used to buy knife)

sale 4:

https://backpack.tf/profiles/76561198271700107#!/compare/1592352000/1592438400

https://backpack.tf/profiles/76561198145372718#!/compare/1592352000/1592438400

https://backpack.tf/profiles/76561198112826532#!/compare/1592352000/1592438400

Keys? untrace

sale 5:

https://backpack.tf/profiles/76561198112826532#!/compare/1592438400/1592697600

https://backpack.tf/profiles/76561198320289008#!/compare/1592524800/1592611200

Sold for ~11 keys

sale 6:

https://backpack.tf/profiles/76561198320289008#!/compare/1592524800/1592611200

https://backpack.tf/profiles/76561198106112825#!/compare/1592524800/1592611200

Sold for 12 keys

sale 7:

https://backpack.tf/profiles/76561198106112825#!/compare/1592697600/1592784000

https://backpack.tf/profiles/76561198165462530#!/compare/1592784000/1592870400

Untrace

sale 8:

https://backpack.tf/profiles/76561198165462530#!/compare/1593388800/1593475200

https://backpack.tf/profiles/76561198151381624#!/compare/1592870400/1593388800

Untrace

sale 9:

https://backpack.tf/profiles/76561198151381624#!/compare/1593388800/1593475200

https://backpack.tf/profiles/76561198203811797#!/compare/1593302400/1593388800

Sold for 11 keys

sale 10:

https://backpack.tf/profiles/76561198203811797#!/compare/1593388800/1593475200

https://backpack.tf/profiles/76561199044780296#!/compare/1593388800/1593475200

Bulk

Sale 11:

https://backpack.tf/profiles/76561199044780296#!/compare/1593561600/1593993600

https://backpack.tf/profiles/76561198039283571#!/compare/1592870400/1593820800

Sold with 1 key for DBD Brim full

Brim Mini:

https://backpack.tf/suggestion/5f277e6ff7925f1f34447339

Suggestion for 16.5 keys

Total is 15.5 keys

Total sales @:

11, 11, 11, 12, 16, 16 keys

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

buyer at 12 keys is higher then other non universal buyers, ignoring.

other buyers at ~10 keys,

taking 11 - 16 keys.