I really wanted that, but since I just opened one gold box and only got a lousy 2 crystals (and a consumable combat pet), I definitely won't even bother trying to get it. At least, I just paid energy credits for the key.
God, what a horrible ripoff the lockbox/lobi store is!!!
Every BO immediately does that, and every BO except the Reman (and maybe Jem'Hadar?) is Exchangeable. Did it fail to go on the Exchange when you tried putting it up for sale? Because that would be a bummer for those of us who don't want to play the lottery.
Additionally, this also proves that BOs can and should have the ability to get MACO and other types of gear as their costumes.
You can just drag the BO from your list (provided they aren't part of your crew) onto the Exchange. That's the way it's always been.