Why not leave the "PMB" out of the address then? When the mail gets delivered to the address, they'll know what to do with it - the "PMB" doesn't help them, all they need is the box #.
Bill
Nodwell RN110 out moose hunting. 4-53 Detroit, Clark 5 spd, 40" wide tracks, 10:00x20 tires, 16,000# capacity, 22,000# weight. You know the mud is getting deep when it's coming in the doors.