Sold for $1000 on Jan 24:

https://i.ibb.co/5s4cBX4/m3.png

https://backpack.tf/profiles/76561198026744290#!/compare/1611360000/1611532800

Paypal for keys sales between Jan 21 and Jan 27:

Jan 21

https://forums.backpack.tf/topic/77120-buying-tf2-keys-for-181-usd-usa-paypal-only/ - $1.81 (going by multiple trusts left on the 22nd, 23rd, and 25th here: https://backpack.tf/trust/76561198309612194)

Jan 22

https://forums.backpack.tf/topic/77127-eu-selling-150-keys-152%E2%82%AC-paypal-only/ - $1.8544 (going by multiple trusts left on the 23rd and 24th here: https://backpack.tf/trust/76561198350704417 - and converting EUR to USD using the 1.22 USD:1 EUR exchange rate on 1/23 and 1/24)

Jan 23

https://backpack.tf/trust/76561198091502579 - Keys sold for $1.77

Jan 24

Nothing

Jan 25

https://forums.backpack.tf/topic/77142-buying-keys-18usd-each-paypal/ - No sales within time range

https://forums.backpack.tf/topic/77155-buying-keys-178-each-pls-trade-me-i-need-keys/ - No sales

https://backpack.tf/trust/76561198128838220 - Keys sold for $1.77

Jan 26

https://forums.backpack.tf/topic/77163-wts-25-keys-for-zelle-185-each/ - $1.85 (going by trust left on the 27th here: https://backpack.tf/trust/76561199073805105)

https://backpack.tf/trust/76561198128838220 - Keys sold for $1.77

Jan 27

https://forums.backpack.tf/topic/77170-h-60-tf2-keys-w-paypal/ - No sales

Sales of $1.77-$1.8544, taking $1.8122

$1000/$1.8122 = 551.8154729

Taking 550 even