It's common practise in Crystal Reports to use a formula on a report that carries out some background logic. But to prevent it displaying, you have to hide the field. Question is, how do you find it again several years later when you've forgotten where it was? I've got a reference to a formula called @AddressedCount but I can't find where it is in the report!
Have you tried File->Export->Export Report (then choose Report Definition from the drop down and hit Export button) This will produce a text file listing all* the elements in the report which you can load up in your favorite text editor and search for whatever you want.
*There are cases where something in a report is not included in the definition file, but it is rare.