I think they are examining all returns more carefully these days even if the buyer just changed her mind. I imagine there have been cases where the return ended up being fake.I've had returns but I've never received any messages from Tradesy about them-I've just seen them moved to one of Tradesy's closets. Though I haven't had any returns in a while and like I commented before they change things. The wording makes it seem like the buyer may have requested a return for not as described. ("...that requires further review")
I hope it works out for you and in a timely manner!