Thank you, now that I think about it, it's very possible that I was getting all exceptions to the present, but it took a short enough time that I didn't notice.
I was advised that because of the size of our fleet (20K+ devices) and the large volume of exceptions generated, GetFeed with a low resultsLimit would be a more efficient way to get the information from 100K+ exceptions per week. I was having sporadic difficulty with timeouts using Get, and I was hoping that I could use GetFeed to more reliably pull a week's worth of exception data. I was hoping to use toDate so I could get only the target week's worth of exceptions, but it sounds like checking the last date of each GetFeed call will be the way to go?