Sale 1:

https://backpack.tf/profiles/76561198082622016#!/compare/1586131200/1586217600

https://backpack.tf/profiles/76561198372064970#!/compare/1586044800/1586217600

Untrace

sale 2:

https://backpack.tf/profiles/76561198372064970#!/compare/1586304000/1586649600

https://backpack.tf/profiles/76561198254861074#!/compare/1586304000/1586390400

Untrace

sale 3:

https://backpack.tf/profiles/76561198254861074#!/compare/1586563200/1586649600

https://backpack.tf/profiles/76561198146259385#!/compare/1586563200/1586649600

Bulky

sale 4:

https://backpack.tf/profiles/76561198146259385#!/compare/1586649600/1586736000

https://backpack.tf/profiles/76561198046813997#!/compare/1581897600/1586736000

sold for 7 keys?

sale 5:

https://backpack.tf/profiles/76561198046813997#!/compare/1581897600/1586736000

https://backpack.tf/profiles/76561198148514448#!/compare/1586649600/1586736000

Sold for ~19 keys

sale 6:

https://backpack.tf/profiles/76561198148514448#!/compare/1586649600/1586736000

https://backpack.tf/profiles/76561198093330769#!/compare/1586649600/1586736000

Untrace

sale 7:

https://backpack.tf/profiles/76561198093330769#!/compare/1586736000/1586822400

https://backpack.tf/profiles/76561198136299906#!/compare/1586736000/1586822400

Sold for 18 keys

sale 8:

https://backpack.tf/profiles/76561198136299906#!/compare/1586822400/1586995200

https://backpack.tf/profiles/76561198381033764#!/compare/1586822400/1587772800

Sold for at least ~10 keys, probably sold for an unusual too?

Sale 9:

https://backpack.tf/profiles/76561198381033764#!/compare/1587772800/1588204800

https://backpack.tf/profiles/76561198272038643#!/compare/1587686400/1587772800

QS?

sale 10:

https://backpack.tf/profiles/76561198272038643#!/compare/1588204800/1588291200

https://backpack.tf/profiles/76561198108184750#!/compare/1588204800/1588291200

Bulk

sale 11:

https://backpack.tf/profiles/76561198108184750#!/compare/1588291200/1588377600

https://backpack.tf/profiles/76561198331508691#!/compare/1588204800/1588291200

untrace

sale 12:

https://backpack.tf/profiles/76561198331508691#!/compare/1588204800/1588291200

https://backpack.tf/profiles/76561197971256728#!/compare/1588291200/1588377600

Sold for 19 keys

sale 13:

https://backpack.tf/profiles/76561197971256728#!/compare/1588291200/1588377600

https://backpack.tf/profiles/76561198089910795#!/compare/1588377600/1588464000

Sold for 20 keys

sale 14:

https://backpack.tf/profiles/76561198089910795#!/compare/1589500800/1590451200

https://backpack.tf/profiles/76561198068999011#!/compare/1589414400/1589500800

Probably for keys

sale 15:

https://backpack.tf/profiles/76561198068999011#!/compare/1589587200/1589673600

https://backpack.tf/profiles/76561198272014381#!/compare/1589587200/1589673600

Sod for Blizzardy Sky High + ~18 keys in sweets

https://bot.tf/stats/listings/MVQ832K6

B/O of 22 keys, easily caps by buyers.

sale 16:

https://backpack.tf/profiles/76561198272014381#!/compare/1589673600/1589760000

https://backpack.tf/profiles/76561198156255538#!/compare/1589673600/1589760000

QS(?)

Sale 17:

https://backpack.tf/profiles/76561198156255538#!/compare/1590278400/1590537600

https://backpack.tf/profiles/76561198065400580#!/compare/1591056000/1591228800

Sold for 23 keys

sale 18:

https://backpack.tf/profiles/76561198294311960#!/compare/1590364800/1591920000

https://backpack.tf/profiles/76561198065400580#!/compare/1591056000/1591228800

Sold for 19 keys

sale 19:

https://marketplace.tf/items/tf2/614;5;u110

$42 / $1.89 = 22.22 keys

https://backpack.tf/item/5188608534

https://bot.tf/stats/listings/Y9QRVLDD

B/O of 24 keys

Total sales @:

18, 19, 19, 19, 20, 22, 22, 23 keys

buyers up to ~18 keys,

near month unsold for 24 keys,

considering 23 resold for less,

taking 19 - 22 keys...