I think you are mistaking TF2 keys with TF2 CD-keys. Team Fortress 2 keys are the keys that can be purchased from the Mann Co store (or crates) to open crates. Since wallet funds can't be transfered yet, they are used as a currency as minim0p already said.
1 decade ago
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Closed 7 years ago.
New Bundles
Can someone told me , why someone wan't tf2 keys if game is free on steam ? :P