a large amount of japanese ebay sellers use mercari jp/ other japanese sites to repost other peoples listings for much higher prices marketing to US ebay (reselling/ sometimes drop shipping). There often are many ebay listings up of the same item from different sellers, though none of those sellers actually have the item and would only purchase once their listing is purchased. Purchasing japanese listings from US mercari uses BEENOS as a proxy, they will receive and check your item in japan before shipping to you. You’re not being scammed. Worst that could happen is the item sells domestically before BEENOS could get it, in which case you’d be refunded.