The Condition markers only appear in the document when conditions are hidden. You will want to show all the conditions and then look for text ranges (and table rows) that have conditions applied. Working with conditions is not trivial; you have to deal with condition formats as integers, for example. Do you have my FrameScript book? There is a chapter in the book that explains working with conditions. If you don't have it, there is a link to the conditions chapter on my home page (http://www.frameexpert.com). Of course, you will have to translate my 10-year-old FrameScript code into ExtendScript, but at least it will give you more understanding of the concepts involved.
I would avoid using "Find" to locate FrameMaker items in your scripts. There are usually better ways to programatically find what you are looking for in a document.
Thanks for the pointer. Yes, I do have your book and I found the chapter on conditional text. I will have a go at it tomorrow when my head is fresh.