Sale 1:

https://backpack.tf/profiles/76561198358296372#!/compare/1590105600/1590192000

https://backpack.tf/profiles/76561198060193542#!/compare/1590105600/1590192000

Sold for 8 keys

sale 2:

https://backpack.tf/profiles/76561198060193542#!/compare/1590537600/1590624000

https://backpack.tf/profiles/76561198280693486#!/compare/1590537600/1590624000

QS

sale 3:

https://backpack.tf/profiles/76561198280693486#!/compare/1590969600/1591056000

https://backpack.tf/profiles/76561198241644844#!/compare/1590969600/1591056000

Sold for ~6 keys

sale 4:

https://backpack.tf/profiles/76561198241644844#!/compare/1592352000/1592438400

https://backpack.tf/profiles/76561198928421771#!/compare/1592352000/1592438400

Bulky / use there

sale 5:

https://backpack.tf/profiles/76561198984875247#!/compare/1584662400/1585440000

https://backpack.tf/profiles/76561198131914222#!/compare/1586131200/1586304000

SCM

sale 6:

https://backpack.tf/profiles/76561198068019087#!/compare/1591574400/1591660800

https://backpack.tf/profiles/76561198829459668#!/compare/1591574400/1591660800

Sold with ST Battin (~2.65) for ~8 keys

Total is 5.45 keys

https://bot.tf/stats/listings/Y80VZ05N

B/O of 8 keys

sale 7:

https://backpack.tf/profiles/76561198829459668#!/compare/1591920000/1592006400

https://backpack.tf/profiles/76561198280693486#!/compare/1592006400/1592179200

QS

sale 8:

https://backpack.tf/profiles/76561198302382325#!/compare/1589328000/1589673600

https://backpack.tf/profiles/76561198050412790#!/compare/1589328000/1589500800

sold for 7 keys

sale 9:

https://backpack.tf/profiles/76561198050412790#!/compare/1590969600/1591056000

https://backpack.tf/profiles/76561198005032783#!/compare/1590969600/1591228800

Sold for 5 keys

sale 10:

https://backpack.tf/profiles/76561198124069409#!/compare/1591056000/1591833600

https://backpack.tf/profiles/76561198005032783#!/compare/1591747200/1591920000

QS

sale 11:

https://backpack.tf/profiles/76561198032986467#!/compare/1585785600/1585872000

https://backpack.tf/profiles/76561198358296372#!/compare/1585699200/1585785600

QS

sale 12:

https://backpack.tf/profiles/76561198358296372#!/compare/1585872000/1585958400

https://backpack.tf/profiles/76561198054448372#!/compare/1585785600/1585958400

Keys

sale 13:

https://backpack.tf/profiles/76561198054448372#!/compare/1586563200/1586908800

https://backpack.tf/profiles/76561198005032783#!/compare/1586390400/1586736000

Untrace

sale 14:

https://backpack.tf/profiles/76561198005032783#!/compare/1586736000/1587254400

https://backpack.tf/profiles/76561197963500354#!/compare/1586908800/1586995200

Untrace

sale 15:

https://marketplace.tf/items/tf2/1015;5;u3030

$16.64 / $1.69 = 9.85 keys <--- https://backpack.tf/item/3949548887

$11.67 / $1.69 = 6.91 keys

$11 / $1.69 = 6.51 keys

$11.95 / $1.75 = 6.83 keys

$7 / $1.75 = 4.00 keys

$20 / $1.88 = 10.64 keys <--- https://backpack.tf/item/3949548887 | https://bot.tf/stats/listings/42522WD7 B/O of 10 keys, capping

$12.82 / $1.98 = 6.47 keys

Total sales @:

4, 5, 5.5, 6, 6.5, 6.5, 7, 7, 7, 8, 10, 10 keys

Buyers up to ~4.74 keys,

seller for ~6.5 keys for a week,

https://backpack.tf/item/8184160102

let's take 6 - 7 keys....