Matthew Perry's Death Being Investigated by United States Postal Service

's death is mobilizing multiple federal agencies -- TMZ has learned the DEA's now getting assistance from the U.S. Postal Inspection Service in its efforts to find the person who gave the actor the ketamine that killed him.

Law enforcement sources tell us ... the USPS' federal investigatory authorities are now involved in the probe, and looking into whether Matthew acquired any drugs through the mail. We're told the postal inspectors are offering their expertise -- including their ability to track packages and other mail-related investigation tools.

Matthew was found unresponsive in the hot tub at his Pacific Palisades home in October ... his assistant called 911, but first responders were unable to revive him. He was

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