Normally getting a war item it would give you a sellback of 5K credits, however instead of getting that sellback of 5K credits the item sells for free.
Can but be duplicated
yes
If so explain
1) Go to dreadcycle item if you have it 2) Look up sell back and see it is worth nothing if you sell it instead of 5K credits.
Did you claim the Dreadcycle from the war chest, or did you claim the Dread Plains Overlord and got the Dreadcycle added on later? If it's the latter, then the 0 sell back is expected since the item was added onto your account and you already have an item with a 5000 sell back (Dread Plains Overlord).