Buried near the Salton Sea, beside a 19th century cemetery outside Onyx, in the Los Padres National Forest, and behind the abandoned cages of the old L.A. zoo, are the last of the cassettes, housed in airtight boxes. This package includes a letter and a flash drive containing a recording unique to each location.
for more information.
A map can be found here: maps.google.com/maps/ms?msid=208883968329236092404.0004c86e3eeb60f2318bc&msa=0
Please be respectful to these locations and their neighbors.
(DISREGARD PAYMENT INFORMATION on this site. These are free... if you're ready to dig.)