If you got time to list an item for sale, you got time to send a quick message with a status update. I can understand if its actually taking a bit to get the item shipped, but at least keep me in the loop! Lack of communication after a sale is a big red flag, especially after a week and multiple times reaching out. Let your buyer know whats going on. I'd be in call out mode already tbh. I wouldn't treat anyone who buys anything from me like that, and I expect at least a modicum of the same type of courtesy from the seller.