If the order is not showing in your eBay Purchases you may have made this as a ' Guest Purchase' , your eBay account is not used for this purpose.
This link below, will explain how to find your order details and make any claim in the future, if you need to .
Do be aware, those delivery dates, are only eBay's estimated and can be a tad optimistic, they are not a guaranteed date, so worth waiting a day or 2 longer.
https://www.ebay.co.uk/help/buying/returns-refunds/returning-item/returning-items-bought-guest?id=40...
@fat567361