To clarify , you are legal to operate as soon as you callsign appears in the FCC database . You don't have to wait for the paper to come in the mail .The record in the FCC database is now legally "the license " and the papers only represent that .You can check for it by going to
www.fcc.gov , select "wireless telecommunications " from the menu on the right side of the page , choose "license search " again on the right side , then choose to search " by name " , unless you already know your FRN .Or , use the link below , and it'll skip the first 3 steps .
Russ, W5RB
http://wireless2.fcc.gov/UlsApp/UlsSearch/searchLicense.jsp