You need to have a store
LINK >> Placing your Store on vacation
Also please beware that it is possible for someone to make a purchase
Since you are away for a week,
That delays shipping
They ding your star and can still leave Negative Feed back
I pull my fixed price ads and have auctions that will end the day after I return
Fixed price ads set to start 2 days before I return
Delivery Confirmation is now called "Tracking"
BUT seems to still be Delivery Confirmation
Copy & Paste from USPS site >>
If you shipped with Express Mail®, you’ll get point-by-point tracking details. If you used another service—USPS Tracking™, Certified Mail™, Registered Mail™ —you’ll see when it went out for delivery.