mail delivery!? help

my pc's, menus and programs are supposed to be delivered today - i checked USPS (not UPS) tracking and they're out for delivery. HOWEVER our mail alredy came. no package. are USPS priority mail packges delivered seperately???????????

thanks, im panicking bc our dropoff tomrorow is at 3 and our mail is very unpredictable.

Yes sometimes they come separately. I know my mailcarrier doesn't want to carry around boxes so they do the route and then drop off the boxes later before they go home.

HTH!