I am honestly unable to answer that question as these mods - unassigned and locked - should be sellable.
Perhaps posting this issue to the SWGOH forums to see if other players have experienced a similar issue, may also result in one of these players providing a work around.
"Serotonindude;c-1864090" wrote:
I wonder how often this question has to come up in the forums again and again before they finally do something about clarifying this in game ???♂️
Since EA help desk asked me to do this....that's how long you'll see the post. That's the reply i got from them.