We are a Fiserv Bank as well and discovered that although we only had a couple of IATs, they were not showing up in the reports on the Director system. However, I've found that if I do a search on the PIM - Source Detail Listing for "IAT", then I am able to find any IATs. Of course you have to wade through all the "Associates", "Pediatrics", and "Aviation" since they use those letters in their spelling, but the only way I've been able to identify them is through this report. Until they fix the problem, that's my only solution.
When you do the search, put a space before and a space after IAT. It doesn't give you all the extra garbage when you do that. (Tried in Director, not PIM, but in theory it should work there as well.)