The UPS Customer Counter should have the lables,,,but just in case they don't,,do like 505 says and print some up yourself and tape one on the address lable side of the box.
I've even seen boxes where it was mearly hand written on and highlighted.
NO HazMat fee is due on loaded ammo (or primed brass). Only on powder and primers,,and those must be shipped by a licensed HazMat shipper anyway.
No special license needed to ship the loaded ammo. Just declare it and lable it properly.
They'll probably demand that you put an adult signiture required on delivery sicker on it also (an additional fee).
One other thing,,,I made the mistake once of saying I had handgun ammo in a package,,should have just stated 'small arms cartridges/ammo'.
The fact that I stated 'handgun' (ammo) made them want to send it overnite delivery because of their rule to send handguns themselves overnite.
Got it straightened out, but it took a while and a look at the rules with the suprv'r.
Ammo is only supposed to go ground service anyway.
Sometimes it's a battle in there with the service counter clerks.