Sale 1:

https://backpack.tf/profiles/76561198412759781#!/compare/1563580800/1563667200

https://backpack.tf/profiles/76561198337734785#!/compare/1563580800/1563667200

QS

Sale 2:

https://backpack.tf/profiles/76561198931837142#!/compare/1565654400/1565913600

https://backpack.tf/profiles/76561198048851745#!/compare/1565827200/1565913600

QS for 12 keys

Sale 3:

https://backpack.tf/profiles/76561198402447009#!/compare/1561680000/1562025600

https://backpack.tf/profiles/76561198394161309#!/compare/1561852800/1562025600

Sold for Cyclone Relaxo + 72 Box Trot + ~2 keys in sweets

Relaxo Mini:

https://backpack.tf/suggestion/5d61ab9bd381726a3c28a415

Suggestion for 8 keys

Trot Mini:

https://backpack.tf/suggestion/5d620187d38172246d314d42

Suggestion for 5.5 keys

Total is 15.5 keys

Sale 4:

https://backpack.tf/profiles/76561198394161309#!/compare/1562025600/1562112000

https://backpack.tf/profiles/76561198342161127#!/compare/1563580800/1563667200

QS

Sale 5:

https://backpack.tf/profiles/76561198880377562#!/compare/1559692800/1560038400

https://backpack.tf/profiles/76561198089253101#!/compare/1559952000/1560038400

Untrace

Sale 6:

https://backpack.tf/profiles/76561198089253101#!/compare/1560211200/1560297600

https://backpack.tf/profiles/76561198195734346#!/compare/1560297600/1560384000

Sold for ~13 keys

Sale 7:

https://backpack.tf/profiles/76561198195734346#!/compare/1560297600/1560384000

https://backpack.tf/profiles/76561198847672167#!/compare/1560297600/1560384000

Sold for ~14 keys

Sale 8:

https://backpack.tf/profiles/76561198847672167#!/compare/1563408000/1563494400

https://backpack.tf/profiles/76561198275656059#!/compare/1563408000/1563494400

Sold for ~14 keys

Sale 9:

https://backpack.tf/profiles/76561198275656059#!/compare/1565049600/1565222400

https://backpack.tf/profiles/76561198206370339#!/compare/1556150400/1565222400

Keys, or unusual, can't accurately tell.

Sale 10:

https://backpack.tf/profiles/76561198318521969#!/compare/1559174400/1559260800

https://backpack.tf/profiles/76561198277409359#!/compare/1559174400/1559260800

Sold for Spooky Box Trot

use there

Sale 11:

https://backpack.tf/profiles/76561198277409359#!/compare/1559174400/1559260800

https://backpack.tf/profiles/76561198337734785#!/compare/1559174400/1559260800

Sold for ~13 keys

Sale 12:

https://backpack.tf/profiles/76561198337734785#!/compare/1560211200/1560297600

https://backpack.tf/profiles/76561198272101245#!/compare/1560211200/1560297600

Sold for ~14 keys

Sale 13:

https://backpack.tf/profiles/76561198272101245#!/compare/1560297600/1560384000

https://backpack.tf/profiles/76561198080091191#!/compare/1560124800/1560384000

Sold for Stormy Copper(10.5) + ~2 keys in sweets

Total is 12.5 keys

Sale 14:

https://backpack.tf/profiles/76561198080091191#!/compare/1561075200/1561593600

https://backpack.tf/profiles/76561198061533354#!/compare/1561334400/1561593600

https://backpack.tf/profiles/76561198142941074#!/compare/1561507200/1561593600

Untrace / confusing...

Sale 15:

https://backpack.tf/profiles/76561198142941074#!/compare/1561507200/1561593600

https://backpack.tf/profiles/76561198140565712#!/compare/1561507200/1561593600

Sold with 1 key in sweets for HG Sterling

Use there

Sale 16:

https://backpack.tf/profiles/76561198140565712#!/compare/1561766400/1561852800

https://backpack.tf/profiles/76561198083047491#!/compare/1561507200/1561852800

Sold for 14 keys

Sale 17:

https://marketplace.tf/items/tf2/341;5;u36

$27 / $1.82 = 14.84 keys

Total sales @:

12, 12.5, 13, 13, 13, 14, 14, 14, 14, 14.84, 15.5 keys

Sellers down to ~14 keys,

buyers up to 11 keys,

gonna call 12 low, 15+ high,

taking 13 - 14 keys.