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Whatever goes up, must come down, am I right? ( ͡° ͜ʖ ͡°)
#Physics
I don't think so.
Unsold at 8 keys:
http://www.tf2outpost.com/trade/24899704 (Professional killstreak, 1 month)
Seller at 7 keys:
http://www.tf2outpost.com/trade/25267533 (Specialized killstreak, 4 days old)
This is all I could find on Outpost that are valid
I didn't think you can use them if they prof killstreaks. Although I guess because you are using that for an unsold, and that should increase its price than it should be fine. I was the one that originally priced this item, and it took a long time to find non-prof killstreak ones XD