I've commuted a ton on my OCR-3 in NYC, and it is unfortunately sitting in NYC right now without me
I don't have it with me to look at but I strongly doubt it has any mounts for panniers anywhere. I have seen some posts on BF regarding adapter mounts that will do the trick however.
EDIT: I'll add that I dislike the adjustable stem on the OCR-3 and I'd recommend replacing it with an non-adjustable type as soon as you figure out what size you prefer.