When you ship vast quantities by UPS, the tracking number and label are generated at the shipper's end - but go into the UPS computers from there, without UPS actually having gotten the package. When UPS does its scheduled pickup, each box is scanned into the UPS system, and from there its forwarded to its destination.
Realize that they COULD be a whole day between shipping entry and UPS getting from B&H. Once its in UPS hands, the "next day" takes place. Thats why there is usually a disclaimer about "orders placed by 1pm will be shipped the same day" (or other qualifying disclaimer).
So... if you called after their cutoff time, the order may be IN the system, but the box might not be there yet.
I go thru this daily in our industry (non - photo related)