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Bought 14th August for $344.99 on marketplace.tf
Hat: https://marketplace.tf/items/tf2/31215;5;u200
Key: https://marketplace.tf/items/tf2/5021;6
Price in keys = 178
Bought 19th August for $230 on mannco.store
Hat: https://mannco.store/item/440-ominous-stare-unusual-alakablamicon
Key: https://mannco.store/item/440-mann-co-supply-crate-key
Price in keys = 130
Average price in keys = 154
Rounded to 155
Some more sales to check out in these histories:
https://backpack.tf/item/11863904154
https://backpack.tf/item/10824651868
Also, after correctly calculating your sales
Marketplace (Keys at $1.89):
$344.99/1.89 = ~183 keys
Mannco (Keys at ~$1.7):
$230/1.7 = ~135 keys
Since you have two sales at 135, 183 (assuming there are no other sales, you will still have to check the above histories), you should not take an averaged flat value, but rather make a range instead of 135 - 183 keys (135 as low end and 183 as high end).
As Vege mentioned, if you have 2 sales that aren't outliers, you can't average them. You need to make a range from the 2 values.
If you need help checking out the other sales you missed, feel free to ask.