The Putnam County Sheriff's Department is warning of thefts from mailboxes.  Sheriff Kevin McConville is reminding residents to avoid using home mailboxes for pickup due to the recent cases.  The Sheriff’s Office has taken a number of reports of complaints where residents have had checks that they were sending out stolen from their mailboxes.  These checks are then being altered to a much higher amount prior to being cashed by the suspects.  Putnam County residents are encouraged to only use secure US Postal Service mailboxes when sending checks, and to report any instances of theft to the Sheriff's Office, where the investigation is ongoing with the assistance of the US Postal Inspectors Office.