rifle / riffle
To search through, or the gun, versus to flip pages.
To rifle is to search through and often to steal: rifle the desk. A rifle is also the gun. To riffle is to flip through: riffle the pages. Do not use riffle the desk for a search.
Examples
Use Someone rifled the drawer.
Use She riffled the pages.
Avoid Someone riffled the drawer. (If you mean a search.)