Good catch, thanks. If there are more than 25 duplicates, we get the first 25 and the 'after' field set, so further requests would be required. I'd originally tried implementing this as a get_content generator, but the json formatting seemed to trip up the function. The response is not a single json object, rather a list containing 2 objects: one representing the original submission and the other containing the <= 25 duplicate submissions.

I will think harder, dig deeper into the code, and try and figure this out.