According to Meadville Tribune (PA)

The former U.S. Postmaster in Cochranton will serve five months in jail for stealing more than $50,000 worth of money and stamps during a two-and one-half year period.
Larry Alan Robison, 57, of 11135 Liberty St. Ext., Meadville, was sentenced to five months in jail followed by five months home detention and then three years probation by U.S. District Judge Sean McLaughlin. Robison also was ordered to pay $52,720 in restitution to the U.S. Postal Service. Robison pleaded guilty in federal court July 25 to one count of theft of government money and property. He had faced a maximum sentence of 10 years in prison and $250,000 in fines.

He was indicted in March by a federal grand jury in Erie for stealing more than $4,507.25 in money and another $1,696.91 in stamps on March 3 while serving as postmaster of the Cochranton Post Office.

Auditors and investigators with the U.S. Postal Service determined that Robison had embezzled an additional $52,720 in connection with the March 2006 theft, according to Christine A. Sanner, the assistant U.S. Attorney who presented the case to court.

“He was taking $400 to $600 a week in stamps and reselling them to customers,” Sanner told the Tribune.

Authorities traced the stamp thefts back about two-and-one-half years, Sanner said.

Also according to court documents:

 It is ordered that the defendant make restitution to United States Postal Service in the amount of $2,000 per month to be garnished from his monthly retirement benefits, together with such payments necessary to reach the total amount of $52,720.05 prior to the completion of the defendant’s sentence, including any term of supervised release. The outstanding balance of the restitution shall not be subject to interest due to the defendant’s inability to pay. The defendant shall make restitution payments from any wages he may earn in prison in accordance with the Bureau of Prisons. Inmate Financial Responsibility Program, through which 50 percent of the defendant’s prison salary shall be applied to restitution. Fine Waived.

 According to ABC News [and per court documents] The Postal Inspectors initially went to post office to investigate reports that Robison was receiving pornography through a post office computer. But eventually they discovered he was stealing by pocketing money from some stamp sales. Postal Inspectors also discovered Robison had falsified a post office box application in order to receive the pornography.