Hey Steve, it was more that I don't want to waste your & Rishi's time trying to fix something that might not be a big issue. I tried using snoop on the interface but don't get any UDP packages in last debug. I will try using snoop again, on the ingress interface, and report back the results!
EDIT: I ran snoop on the external interface for an hour, no UDP packages whatsoever (with just that IP filter) coming in. I'm quite sure there won't be any if there isn't any now, after 3 times.