Team Fortress 2
Counter-Strike: Global Offensive
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2 recent sales
sold for a nebula universal translator (in-date at 185) and 10 keys pure
https://backpack.tf/profiles/76561198002186909#!/compare/1533772800/1534032000 - ???
185 + 10 = 195 keys
$399.99 marketplace.tf (I know its a duped sale, but you can use those for a high end)
http://manic.tf/keyprice/?at=2018-10-07 = keys were $1.80
$399.99 / $1.80 = 222.22 = 222 keys
You can use Duped sales if the average is higher than the clean sales. You can't cherry pick the higher ones out.
https://backpack.tf/profiles/76561198437172792#!/compare/1534204800/1534291200 - 164 Keys
https://backpack.tf/profiles/76561198149175706#!/compare/1534809600/1534896000 - SFB DCO + DBD Headsplitter + 40 Keys + Steaming Kabuto
https://backpack.tf/profiles/76561198088391137#!/compare/1535328000/1535414400 - Sold + Subatomic Hot Air (11 Keys) for a Scorching Mancer's (215 Keys)
https://backpack.tf/profiles/76561198081706519#!/compare/1535932800/1536364800 - Scorching Tossle (120 Keys) + Pro KS Aussie Scatter (~35 Keys)
https://backpack.tf/profiles/76561198132561543#!/compare/1536537600/1536624000 - 170 Keys
https://backpack.tf/profiles/76561198160856661#!/compare/1537056000/1537142400 - Nebula Translator (185 Keys) + 5 Keys
https://backpack.tf/profiles/76561198176297517#!/compare/1537315200/1537488000 - 200 Keys
https://backpack.tf/profiles/76561198207086995#!/compare/1538179200/1538265600 - Better for the Condor
So that's 155, 164, 170, 190, 200, and 204 Keys (the DCO sale is high) plus your sales. 170 took 2 days, so 190 - 220 (or 222) works.