How do I sell unidentified mythics

So i just randomly dropped a mythic while completing some random caves and ik which mythic it is cause it is the only one in that range of that type ( its aftershock ) and I saw some people selling unidentified version of it which was higher than the lowest so I wanted to do the same but mine is a box while the ones of trade market is a relic skin so how do I do that so can anyone tell me how do I do that or I cant?

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okay so nvm i found out how to do that its in the trade market and shows how to reveal item name but not identification

 

i'd reccomend keeping it in box form as some people pay higher for those