Sale 1:

https://backpack.tf/profiles/76561198026052716#!/compare/1547856000/1548028800

https://backpack.tf/profiles/76561198282013157#!/compare/1524960000/1549584000

Untrace

Sale 2:

https://backpack.tf/profiles/76561198129860851#!/compare/1546387200/1546473600

https://backpack.tf/profiles/76561198841365001#!/compare/1546387200/1546473600

Untrace

Sale 3:

https://backpack.tf/profiles/76561198841365001#!/compare/1546387200/1546473600

https://backpack.tf/profiles/76561198267364698#!/compare/1546387200/1546473600

Sold for ~10 keys

Sale 4:

https://backpack.tf/profiles/76561198267364698#!/compare/1546387200/1546473600

https://backpack.tf/profiles/76561198148139523#!/compare/1546387200/1546473600

Sold for Steaming Glove + ~2 keys in sweets

Glove Mini:

https://backpack.tf/suggestion/5c7a23f0d3817214965db2bf

Suggestion for 9.5 keys

Total is 11.5 keys

Sale 5:

https://backpack.tf/profiles/76561198148139523#!/compare/1546473600/1546560000

https://backpack.tf/profiles/76561198346537007#!/compare/1546473600/1546560000

Sold with negligible sweets for CTFL Polar

Polar Mini:

https://backpack.tf/suggestion/5c7a25b0d381721749029589

Suggestion for 15 keys

Sale 6:

https://backpack.tf/profiles/76561198346537007#!/compare/1547078400/1547164800

https://backpack.tf/profiles/76561198079764636#!/compare/1547078400/1547164800

Sold with negligible sweets for KaW Brain Warming

Use there

Sale 7:

https://backpack.tf/profiles/76561198841947007#!/compare/1544140800/1544745600

https://backpack.tf/profiles/76561198837901179#!/compare/1543622400/1544140800

Untrace

Sale 8:

https://backpack.tf/profiles/76561198361904996#!/compare/1541894400/1548806400

https://backpack.tf/profiles/76561197962889170#!/compare/1548720000/1548892800

https://backpack.tf/profiles/76561198312480435#!/compare/1548806400/1548892800

Untrace / QS

Sale 9:

https://backpack.tf/profiles/76561198312480435#!/compare/1550102400/1550188800

https://backpack.tf/profiles/76561198064804350#!/compare/1550102400/1550188800

https://backpack.tf/profiles/76561198002757046#!/compare/1550102400/1550188800

Bulk / QS

Sale 10:

https://backpack.tf/profiles/76561198002757046#!/compare/1550534400/1550620800

https://backpack.tf/profiles/76561198354399482#!/compare/1550448000/1550620800

Sold for ~10 keys

Sale 11:

https://backpack.tf/profiles/76561198072929068#!/compare/1547078400/1547164800

https://backpack.tf/profiles/76561198355300967#!/compare/1547078400/1547164800

Sold for Aces Swatter

Swatter Mini:

https://backpack.tf/suggestion/5c79a3fa678072689a1346de

Suggestion for 11 keys

Sale 12:

https://backpack.tf/profiles/76561198355300967#!/compare/1547078400/1547164800

https://backpack.tf/profiles/76561198411495266#!/compare/1547078400/1547164800

Sold with ~7 keys in sweets for TW Hedge

Use there

Sale 13:

https://backpack.tf/profiles/76561198411495266#!/compare/1550016000/1550102400

https://backpack.tf/profiles/76561198114620157#!/compare/1550016000/1550102400

Untrace

Sale 14:

https://backpack.tf/profiles/76561198114620157#!/compare/1550016000/1550102400

https://backpack.tf/profiles/76561198012613726#!/compare/1550016000/1550102400

Sold for ~9.5 keys

Sale 15:

https://marketplace.tf/items/106;5;u32

$21.97 / $1.77 = 12.41 keys

Total sales @:

9.5, 10, 10, 11, 11.5, 12.41, 15 keys

Buyers up to 9.5 keys,

Seller at ~12 keys,

taking 10 - 12 keys