Salazar faces a maximum five years in prison and/or a $250,000 fine on each conviction.
Salazar, who pleaded guilty Thursday, had worked as a U.S. Postal Service field maintenance mechanic since March 2001.
The undercover investigation began in December when more than 90 pieces of opened mail turned up in a trash can outside a drug store.
Security video from the CVS store helped identify Salazar as the driver of a postal truck who carried items to the same trash can where the stolen mail was found.
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