They found a vibrator.
The incident took place on Monday at Petrozavodsk in the northwest republic of Karelia and followed a call from a postal worker who had identified a suspect package, a police spokeswoman said.
"The post building was ringed by the security forces and people were evacuated," she said.
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"In the package the bomb squad found a vibrator."
The sex toy had apparently been turned on "by accident".Nerves are on edge in Russia after an attack in January on the Domodedovo airport near Moscow left 37 dead. Two suicide bombers killed 40 in March 2010 in the Moscow metro.
False bomb scares and evacuations have since affected commercial centres, stations and other public places.
