Actually it was the plot of salami slicing.
He did this on a large volume of accounts for several years and stole a fortune. The theft on each account was so small the customers didn't notice.
An example of salami slicing, also known as penny shaving, is the fraudulent practice of stealing money repeatedly in extremely small quantities, usually by taking advantage of rounding to the nearest cent (or other monetary unit) in financial transactions. It would be done by always rounding down, and putting the fractions of a cent into another account. The idea is to make the change small enough that any single transaction will go undetected.[1][2]
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