The crime happened about 3:30 a.m. at the post office in the 3300 block of Smith Avenue, according to a deputy at the Palmdale Sheriff’s Station.
Deputies chased after the trucks until one crashed at the intersection of Shannondale Road and Sierra Highway. The driver of that truck was picked up by someone following in a dark Ford Mustang that got away.
The second truck was found along Escondido Canyon Road and Jones Canyon Road.
Authorities say five sets of key rings with master keys to several community mail boxes were taken.