Thank you Cashew for all these wonderful suggestions #CashtheDEW

Searing Plasma Antarctic Eyewear

https://marketplace.tf/items/tf2/30977;5;u15

$50 on April 21 = 28 keys

$50 on April 19 https://bot.tf/stats/listings/Y79111EL https://backpack.tf/item/7021113263 b/o 30 = 28 keys

$45.56 on April 17 https://backpack.tf/item/7021113263 https://bot.tf/stats/listings/MLV6GNPO b/o 22, caps at 22 key

https://backpack.tf/profiles/76561198331508691#!/compare/1587254400/1587340800

https://backpack.tf/profiles/76561198125534438#!/compare/1586822400/1587340800 20 keys match

https://backpack.tf/item/7021113263

https://bot.tf/stats/item?def=30977&q=5&ef=Searing%20Plasma&craft=1&aus=0&ks=0 bought for 19 keys + 6 ref, sold for 19 keys + 20 ref

https://backpack.tf/profiles/76561198305494036#!/compare/1586995200/1587081600

https://backpack.tf/profiles/76561198160856661#!/compare/1586995200/1587081600

https://backpack.tf/profiles/76561198125534438#!/compare/1586822400/1587340800

https://backpack.tf/profiles/76561198135665117#!/compare/1587254400/1587340800 12 keys match, but thats definitely not the full sale

https://backpack.tf/profiles/76561198135665117#!/compare/1587254400/1587340800

https://backpack.tf/profiles/76561198035499016#!/compare/1587254400/1587340800 unknown

https://backpack.tf/profiles/76561198035499016#!/compare/1587340800/1587427200

https://backpack.tf/profiles/76561198280667527#!/compare/1587168000/1587427200 16 keys + 20 ref

https://bot.tf/stats/listings/M0D0VV5E b/o 20

https://backpack.tf/profiles/76561198337734785#!/compare/1582934400/1583020800

https://backpack.tf/profiles/76561198067018151#!/compare/1573776000/1583020800 unknown

https://backpack.tf/profiles/76561198362983846#!/compare/1586476800/1586822400

https://backpack.tf/profiles/76561198073242439#!/compare/1586736000/1586822400 some keys

No reason to exclude 28, going 20 - 28