The manager of a Kenner post office stole $630,000 worth of stamps and sold them online after losing more than $667,000 while gambling in recent years, federal authorities said this week. Prosecutors also allege Ryan Cortez, 46, embezzled nearly $10,000 from a church in Des Allemands that listed him as its treasurer. The alleged theft was to fuel a gambling problem to which he confessed, the feds allege. And in the process of allegedly stealing stamps, authorities said, Cortez made history by committing one of the largest internal thefts the U.S. Postal Service has ever seen.