Is the item in your Purchase History, is this definitely an eBay item? Does anyone in your household have access to your account ?
I understand you have not ordered this, but if you have been charged for an eBay item someone had access to your account to do this, and if the item doesn't arrive , open a case for item not received and escalate after 3 days if not refunded beforehand.
Change your password on your eBay account now, preferably log off when not in use, too.
@jacquchadb-0