Sale 1:

https://backpack.tf/profiles/76561198368744547#!/compare/1549238400/1549497600

https://backpack.tf/profiles/76561198061108999#!/compare/1549411200/1549497600

Sold with ~2 keys in sweets for Stormy Slouch

Use there

Sale 2:

https://backpack.tf/profiles/76561198225796692#!/compare/1546387200/1546473600

https://backpack.tf/profiles/76561198068381735#!/compare/1546387200/1546473600

Sold for N&B Larrikin + ~3.5 keys in sweets

Larrikin instasold for ~7.5 keys, taking that.

Total is 11 keys

Sale 3:

https://backpack.tf/profiles/76561198068381735#!/compare/1546646400/1546819200

https://backpack.tf/profiles/76561198036160618#!/compare/1500163200/1547078400

Transfer

Sale 4:

https://backpack.tf/profiles/76561198068381735#!/compare/1547769600/1550534400

https://backpack.tf/profiles/76561198052235289#!/compare/1474416000/1549411200

Untrace

Sale 5:

https://backpack.tf/profiles/76561198281266423#!/compare/1546905600/1546992000

https://backpack.tf/profiles/76561198432478584#!/compare/1546819200/1546905600

Sold for keys, around 9?

Sale 6:

https://backpack.tf/profiles/76561198432478584#!/compare/1546905600/1546992000

https://backpack.tf/profiles/76561198113853563#!/compare/1546646400/1546992000

Sold for ~10 keys

Sale 7:

https://backpack.tf/profiles/76561198113853563#!/compare/1547164800/1547251200

https://backpack.tf/profiles/76561198261849239#!/compare/1547078400/1547251200

Sold for ~12 keys

Sale 8:

https://backpack.tf/profiles/76561198127239586#!/compare/1550016000/1550188800

https://backpack.tf/profiles/76561198402778829#!/compare/1550016000/1550102400

https://backpack.tf/profiles/76561198024867201#!/compare/1549929600/1550016000

Untrace / QS

Sale 9:

https://backpack.tf/profiles/76561198067948646#!/compare/1546128000/1547251200

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

Sold for TW Hive Minder

Use there

Sale 10:

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

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

Sold for Planets Bonk

Use there

Sale 11:

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

https://backpack.tf/profiles/76561198361891514#!/compare/1547078400/1547164800

Sold for ST Brewed(11.5)

Sale 12:

https://backpack.tf/profiles/76561198361891514#!/compare/1547251200/1547424000

https://backpack.tf/profiles/76561198834678807#!/compare/1547510400/1547683200

Keys?

Sale 13:

https://backpack.tf/profiles/76561198834678807#!/compare/1547683200/1548028800

https://backpack.tf/profiles/76561197997268820#!/compare/1547683200/1547769600

Untrace

Sale 14:

https://backpack.tf/profiles/76561198002757046#!/compare/1543622400/1543708800

https://backpack.tf/profiles/76561198259500466#!/compare/1543622400/1543708800

Sold for ~10 keys

Sale 15:

https://backpack.tf/profiles/76561198259500466#!/compare/1544400000/1544486400

https://backpack.tf/profiles/76561198085363794#!/compare/1544400000/1544486400

Sold for ~10 keys

Sale 16:

https://backpack.tf/profiles/76561198085363794#!/compare/1544572800/1544659200

https://backpack.tf/profiles/76561198064986495#!/compare/1544400000/1544659200

Sold for 11 keys

Sale 17:

https://backpack.tf/profiles/76561198064986495#!/compare/1544659200/1544745600

https://backpack.tf/profiles/76561198135268403#!/compare/1544659200/1544745600

Sold for ~10 keys

Sale 18:

https://backpack.tf/profiles/76561198135268403#!/compare/1544918400/1545004800

https://backpack.tf/profiles/76561198304476963#!/compare/1544745600/1544918400

Keys

Sale 19:

https://backpack.tf/profiles/76561198304476963#!/compare/1544745600/1544918400

https://backpack.tf/profiles/76561198396210582#!/compare/1544832000/1544918400

Sold for 10 keys

Sale 20:

https://backpack.tf/profiles/76561198396210582#!/compare/1544918400/1545177600

https://backpack.tf/profiles/76561198158554103#!/compare/1545091200/1545177600

Spell

Sale 21:

https://backpack.tf/profiles/76561198158554103#!/compare/1545091200/1545177600

https://backpack.tf/profiles/76561198043566764#!/compare/1545091200/1545177600

Sold for 6 keys + negligible sweets

Sale 22:

https://backpack.tf/profiles/76561198043566764#!/compare/1547337600/1547424000

https://backpack.tf/profiles/76561198069414668#!/compare/1547337600/1547424000

Sold for ~10 keys

Sale 23:

https://backpack.tf/profiles/76561198069414668#!/compare/1547424000/1547510400

https://backpack.tf/profiles/76561198370775141#!/compare/1547424000/1547510400

Sold for 11 keys

Sale 24:

https://backpack.tf/profiles/76561198370775141#!/compare/1548374400/1548460800

https://backpack.tf/profiles/76561198286485732#!/compare/1548374400/1548460800

Sold for DP Escorter + ~1 key in sweets

Use there

Sale 25:

https://backpack.tf/profiles/76561198286485732#!/compare/1549584000/1549670400

https://backpack.tf/profiles/76561198200126771#!/compare/1549584000/1549670400

Sold with negligible sweets for Stormy Connoisseur

Sale 26 - 28:

https://marketplace.tf/items/626;5;u59

$32.46 / $1.67 = 19.44 keys

$15.09 / $1.75 = 8.62 keys

$32.86 / $1.78 = 18.46 keys

Total sales @:

6, 8.62, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11.5, 12, 18.46, 19.44 keys

Sellers at 14 keys,.

Buyers up to 9.5 keys,

gonna say enough pure sales to put down 'use there' on all unusual sales,

taking 10 - 12 keys