Normally you don't use tradeit.gg or swap.gg sales. One reason my scorching flames HKC suggestion wasn't viable was because it was dumped to a site like that. Also, there's no certified conversion of CS:GO keys to TF2 keys, so the value would be a little bit hard to figure out (if it was a valid sale)

https://gyazo.com/7c08062ef9fa034d38e16183ba1df24e

Here's the full list of keys and below are my calculations.

Gamma 2

https://gyazo.com/7933d9ee08a605f3a93641c76e300c9d

$2.59 (x39)

Chroma

https://gyazo.com/3a57cad6b0106f8278634e911d068a8a

$2.60 (x3)

Chroma 3

https://gyazo.com/cab85241846ebe2d8a2cf4affca3e7f1

$2.59 (x2)

Huntsman

https://gyazo.com/5fb3667d16bc9940cb19958cf3b3c1df

$2.77 (x27)

Spectrum

https://gyazo.com/4025ecfbbaf8eb8bbb4097a30a787160

$2.59 (x40)

Clutch

https://gyazo.com/70db80c38dfb3945303159dacc110023

$2.60 (x97)

Spectrum 2

https://gyazo.com/d62f2ef42fb428098d01fbef0ab9ba4d

$2.60 (x13)

Gamma

https://gyazo.com/ddbba8b9675995fe0fdf3bbe89b6f438

$2.59 (x7)

Chroma 2

https://gyazo.com/defe920cd7ccf6e908ec4770e1d09366

$2.62 (x20)

Phoenix

https://gyazo.com/fb6f5e49d113175e7c1d888ffb2768be

$2.70 (x1)

Glove

https://gyazo.com/15d3c4fa9e10e910514bd7d55725ebc5

$2.60 (x17)

Average = $695.81 (total of all key values * their quantity) / 266 (amount of keys in trade) = $2.6158 = $2.62 per key

TF2 keys

https://gyazo.com/982dde0e090c7f21b88822556e0c4ab7

$2.33 (x4)

So the ratio is: Average of CS:GO keys ($2.62) / Average of TF2 keys ($2.33) = 1:1.12446 = 1:1.12

CS:GO keys to TF2 keys here: 266 (amount of CS:GO keys in the trade) x 1.12 (high end of the ratio) = 297.92 = 298 keys

That makes the trade 298 (cs:go to tf2 keys) + 4 (amount of tf2 keys involved) = 302 keys