If I were you I'd also check your Store Log > Items You Bought. Find the transaction and take a screenshot, it may be useful eventually.
By the way, it might be worth it to ask the seller if they have Astra: Mini Black Flapping Devil Wings in their inventory. If they ask you why you could say you bought one from them but are experiencing a weird glitch and their confirmation would be helpful.
Good luck with the ticket and recovering your item.