El Monte

hallo I have 2 summer 2020 keys i want to sell and spend those refined in cosmetics but when i go to "buy/sell keys" section it appears like a have no keys in my backpack (though the keys are arleady tradable) and if i go to "sell items" section, it let me make the trade but I don't know if the refined i get in exange is actually tradable back so i can buy my cosmetics. Pls any helpful coment, would be grate🙏