Are you the buyer?
eBay shows an estimated delivery date for every purchase. Check your email confirmation and look at the latest date in the estimated delivery window. If your item doesn't arrive by that date you can file a non-receipt claim.
Before filing a claim, check your purchase history page to see if the seller provided tracking and if the package is showing active tracking movement to your location. If the package is still moving with the carrier, give it more time for delivery before filing a claim.
You have 30 days from the latest estimated delivery date to file a claim. Instructions here: https://www.ebay.com/help/buying/returns-refunds/get-help-item-hasnt-arrived?id=4042
If the problem is the tracking shows delivery but you didn't receive the package, that will change the advice. Come back to provide more details if that's what happened.
