From the
Season 7 Dev Blog #27.
Quote:
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NOTE: The above stats are subject to change. The box that the ship comes in, which cannot be opened until the minimum rank listed above, is bound upon pickup.
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So the only reason why it is in a box is if the player is not a level 40 or have no ship slots. So a level 5 player can throw the ship box in their box until they are level 40. If there is any info about the box saying it is tradeable, then its a bug.