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An item at a store that is small enough to conceal and be stolen. Pilfer - to steal.
i know 'pilfer a sack' comes from Baseball and to pilfer means to steal. So I'm guessing that to 'pilfer a sack' means to steal a base.
Pilfer means to steal things of small value in small quantities, often in a sneaky or petty manner.
He could use his own password to connect from outside of the building and pilfer information and perhaps funds.
Steal. Rob.