Even if he was in AQ or AW, and you have already stepped on final node, you’d have to wait until full day's AQ/AW Timer has finished (and Mail rewards sent) before they would become fully “unlocked” to be able to sell them.
Why are people putting their Namor/Cull in Quests that last a full 24 hours (or even 48 hours in case of AW), if they know there is a cutoff as to when they will be allowed to sell them ??Or just wanting to get your name in the Forums about some supposed “bug” ?