Hi Sedy,
Currently the rares and uniques that drop in the new maps come sealed and with a restriction of how many you can have open.
Could I please suggest:
1) That they are tradable (no one really buys them, and it just adds an extra step to the decomping process)
2) That you can have more than one of the same type open (currently if you have say, one accessory opened e.g. if you have a full bag of stuff to decomp, you can't open a second identical one. Similarly if you want to equip one, you can't open another one.) It doesn't really seem necessary, especially the rares.
Thanks for considering.