Smile. You can hide so much behind it.

Sale 1:

https://backpack.tf/profiles/76561198135388328#!/compare/1538006400/1538092800

https://backpack.tf/profiles/76561198115600660#!/compare/1538006400/1538092800

Sold for 11 keys

Sale 2:

https://backpack.tf/profiles/76561198115600660#!/compare/1538092800/1538179200

https://backpack.tf/profiles/76561198040675606#!/compare/1537920000/1538265600

Sold for 20 keys?

Sale 3:

https://backpack.tf/profiles/76561198383300546#!/compare/1534896000/1536796800

Untrace

Sale 4

https://backpack.tf/profiles/76561198383300546#!/compare/1536969600/1537142400

https://backpack.tf/profiles/76561198024925599#!/compare/1536969600/1537056000

Bulk

Sale 5:

https://backpack.tf/profiles/76561198049888405#!/compare/1535414400/1535587200

https://backpack.tf/profiles/76561198049731627#!/compare/1535500800/1535587200

Sold for ~16 keys in items

Total sales @:

11, 16, 20 keys

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

Buyers up to 11,

Seller at 18

The sale at 20 didn't involve anything else. The reason the IDs don't match(assuming that was your main concern), was because the paint was removed immediately after the trade, as you can see in the comparison links.

16-20 could work I suppose.