Special Agent Jeff Killeen says the returned money doesn't cancel out the crime that was committed Dec. 9 at the PNC Bank in West Newton, a tiny borough about 20 miles southeast of Pittsburgh.
The FBI won't say how much the robber took, but say the money in the envelope was about 80 percent of the amount stolen. It was separated into stacks of $5s, $10s, $20s and $100s.
The FBI announced the mailing on Tuesday and says it is checking the package for fingerprints and other clues. They believe the robber is local because he was wearing a yellow Pittsburgh Steelers T-shirt.