Sale 1:

https://backpack.tf/profiles/76561198219570961#!/compare/1586217600/1588032000

https://backpack.tf/profiles/76561198841279602#!/compare/1586131200/1586217600

QS

Sale 2:

https://backpack.tf/profiles/76561198147561462#!/compare/1585180800/1585267200

https://backpack.tf/profiles/76561198408606810#!/compare/1585180800/1585267200

bulky

Sale 3:

https://backpack.tf/profiles/76561198352605277#!/compare/1580428800/1581033600

https://backpack.tf/profiles/76561198354656940#!/compare/1580774400/1580860800

Sold for 4.35 keys

sale 4:

https://backpack.tf/profiles/76561198354656940#!/compare/1580774400/1580860800

https://backpack.tf/profiles/76561198070146753#!/compare/1581120000/1581638400

SCM

sale 5:

https://backpack.tf/profiles/76561198354656940#!/compare/1581465600/1581552000

https://backpack.tf/profiles/76561198261782491#!/compare/1565395200/1582934400

Untrace

sale 6:

https://backpack.tf/profiles/76561198261782491#!/compare/1565395200/1582934400

https://backpack.tf/profiles/76561198386731866#!/compare/1583107200/1585008000

Untrace

sale 7:

https://backpack.tf/profiles/76561198340634356#!/compare/1584403200/1584489600

https://backpack.tf/profiles/76561198211741396#!/compare/1583798400/1584489600

Sold for 4 keys (bot.tf)

Sale 8:

https://backpack.tf/profiles/76561198211741396#!/compare/1584489600/1584576000

https://backpack.tf/profiles/76561198024999234#!/compare/1584230400/1584662400

Untrace

sale 9:

https://marketplace.tf/items/tf2/30621;5;u3009

$9.5 / $1.76 = 5.40 keys

$9.5 / $1.77 = 5.37 keys

Bot.tf:

https://bot.tf/stats/item?def=30621&q=5&ef=Silver%20Cyclone&craft=1&aus=0&ks=0

1 @ 4.05 keys

1 @ 4.85 keys,

1 @ 4.90 keys,

Total sales @:

4.05, 4.35, 4.85, 4.90, 5.35, 5.40 keys

buyers up to ~4.05 keys,

https://bot.tf/stats/listings/Y35KX1L1

one seller at 4.90 keys unsold for months,

calling 4.05 low,

5.35 high,

taking 4.35 - 4.90 keys