Sale 1:

https://backpack.tf/profiles/76561198136977926#!/compare/1543276800/1543622400

https://backpack.tf/profiles/76561198258168272#!/compare/1542758400/1543363200

Untrace

Sale 2:

https://backpack.tf/profiles/76561198258168272#!/compare/1544832000/1544918400

https://backpack.tf/profiles/76561198123097015#!/compare/1544832000/1544918400

Sold for CH Trophy Belt (37.5)

Sale 3:

https://backpack.tf/profiles/76561198081270783#!/compare/1539561600/1539648000

https://backpack.tf/profiles/76561198156255538#!/compare/1539475200/1539648000

Sold for 27 keys

Sale 4:

https://backpack.tf/profiles/76561198156255538#!/compare/1541289600/1541376000

https://backpack.tf/profiles/76561198027059756#!/compare/1541376000/1541462400

https://backpack.tf/profiles/76561198068234401#!/compare/1541289600/1541376000

Untrace

Sale 5:

https://backpack.tf/profiles/76561198350910856#!/compare/1541980800/1542067200

https://backpack.tf/profiles/76561198294663533#!/compare/1541980800/1542067200

Untrace

Sale 6:

https://backpack.tf/profiles/76561198294663533#!/compare/1543449600/1543536000

https://backpack.tf/profiles/76561198850323526#!/compare/1543363200/1543536000

Bulk

Sale 7:

https://backpack.tf/profiles/76561198850323526#!/compare/1543536000/1543795200

https://backpack.tf/profiles/76561198049884052#!/compare/1543449600/1543622400

Untrace

Sale 8:

https://backpack.tf/profiles/76561198049884052#!/compare/1544054400/1544140800

https://backpack.tf/profiles/76561198115699456#!/compare/1544054400/1544140800

Sold for 28 keys

Sale 9:

https://marketplace.tf/items/30718;5;u103

Sold for 39, 56.90 USD

Keys at 1.72 USD

Totals are 22.67, 33.08 keys

Total sales @:

22.67, 27, 28, 33.08, 37.5 keys

Buyers up to 26 keys,

Seller for 33 keys,

Let's take 27 - 33 keys (27 did not sell quickly afterwards.