https://marketplace.tf/items/tf2/30140;5;u58

$599.99 / $1.84 = 326.08 keys https://backpack.tf/item/4590635774

$650.00 / $1.74 = 373.56 keys https://backpack.tf/item/2893542282

https://backpack.tf/profiles/76561198206735991#!/compare/1601424000/1601510400

https://backpack.tf/profiles/76561197994697258#!/compare/1601510400/1601683200

321 keys

https://backpack.tf/profiles/76561198114402400#!/compare/1600473600/1600646400

https://backpack.tf/profiles/76561198092048287#!/compare/1600041600/1600646400

Stormy 13th Hour Bloke's Bucket Hat - 150 keys https://backpack.tf/suggestion/5f9fde2c6ea89e67710d41fc

Stormy 13th Hour Scotch Bonnet - 135 keys https://backpack.tf/suggestion/5f881c14c189863f262d9d1e

Flaming Lantern Industrial Festivizer - 40 keys https://backpack.tf/suggestion/5fc438ee90daab13f64ce757

Sweets that ensure this caps at the 300 key buyout https://bot.tf/stats/listings/4J9Q62EV

https://backpack.tf/profiles/76561198092048287#!/compare/1601251200/1601424000

https://backpack.tf/profiles/76561198331167728#!/compare/1601078400/1601251200

Added for Burning Yellow Belt, likely better used on the belt

https://backpack.tf/profiles/76561198331167728#!/compare/1601596800/1601683200

https://backpack.tf/profiles/76561197962717784#!/compare/1602115200/1605312000

325 keys, looks like their backpack came into existence after it was bought and sold though

https://backpack.tf/profiles/76561197962717784#!/compare/1602720000/1602806400

https://backpack.tf/profiles/76561198129552058#!/compare/1602720000/1602806400

326 keys

amazing profit

https://backpack.tf/profiles/76561198129552058#!/compare/1606089600/1606176000

https://backpack.tf/profiles/76561198122604075#!/compare/1606089600/1606176000

Bulk for Cloudy Moon Crone's Dome

https://backpack.tf/item/2213721858

Nothing

https://backpack.tf/profiles/76561198010742559#!/compare/1606780800/1607040000

https://backpack.tf/profiles/76561197992711280#!/compare/1606953600/1607040000

Bulk for Burning Polar Pullover

https://backpack.tf/item/2893542282

Nothing

https://backpack.tf/profiles/76561198031432614#!/compare/1602460800/1602806400

https://backpack.tf/profiles/76561198129552058#!/compare/1602720000/1602806400

125 keys + Green Black Hole Lucky Shot

Lucky Shot can't be updated https://backpack.tf/suggestion/5f6b57ad4e2a206ae8180a2c

https://backpack.tf/profiles/76561198129552058#!/compare/1604448000/1604534400

https://backpack.tf/profiles/76561197993888396#!/compare/1604448000/1604534400

It looks like 157 keys +

Nebula Translator

Strange Professional Killstreak Australium Grenade Launcher

Dead Presidents Hustler's Hallmark

the latter three items were sold for 263 keys in the same day

Totaling the trade to 420 keys

https://backpack.tf/profiles/76561197993888396#!/compare/1604707200/1604793600

https://backpack.tf/profiles/76561198139171368#!/compare/1604707200/1604793600

Cloud 9 Virtual Viewfinder + Terror Watt Antlers

traded for

Frostbite Team Captain + Chromatica Sophisticated Smoker

Doesn't really seem usable for any of the items

Not using

https://backpack.tf/item/4590635774

Tradebacks

Sales:

300

321

325

326

326

374

420

Going with 300-374