now coupon can be used for craft and now you have removed coupon from raid reward. ! 
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Sort of the point, the crate is designed to flush the remaining ones from the system via trade.
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90% of player have pèutted in the marked and havce selled it. market can work without player in reduced mode but can work.
if they whant to remove is very easy, check the medium price and give coin to the player.