I just found one to and was told my law that they are to be mailed to the Secretary of Defense at the Pentagon. See the following.


Official Policy on Lost Dogtags and other U.S. Military property.
Because there are many bogus dogtags being "found" everyday, and because
too many fraudulent people are attempting to make personal contact with
veterans or their families with the hope of seeking a reward or
obtaining publicity, the following official policy on LOST AND FOUND
MILITARY ITEMS is being provided to all veterans. Please forward this
information to other American veterans and veterans organizations.

OFFICIAL POLICY: LOST UNITED STATES MILITARY PROPERTY

1. Found U.S. Military items remain the property of the United States
Government and the Department of Defense as official custodian.

2. Found military items should not be retained by the finder who is
seeking, for
whatever reason, to make personal contact with the GI who
lost the item, or a member of the GI's family. By law, found military
items must be mailed immediately to:
Secretary of Defense
Room 3E880
The Pentagon
Washington DC 20301

3. The Dept of Defense has many resources at its disposal to return
and/or preserve lost U.S. military items.

4. When sending items to the Secretary of Defense the finder should
include a letter describing the place and circumstances in which the
item was found, and the finder's personal contact information for
Department of Defense investigators:

WHERE WAS THE ITEM YOU HAVE ENCLOSED FOUND
_________________________________________________________
DATE THE ITEM WAS FOUND
_________________________________________________________
NAME OF FINDER
_________________________________________________________
FINDER'S
ADDRESS
____________________________________________________
CITY ____________________________________________________
STATE/ZIP ____________________________________________________
PHONE ____________________________________________________
EMAIL ____________________________________________________