At the suggestion of SeaBird (via Gordon Walker), I manually reset the CTD's "sample number" to something reasonable and tried downloading its stored data again. This does not appear to have produced any more data than previous attempts.
So in terms of direct downloads from the CTD, we have data from August 23rd to September 6th, 2011. We are missing data from that point until the following year, September 27th, 2012.
In terms of data reported to the station, we have the initial period through October 4th, and a set dating from March 19th to July 19th, 2012.
Mike J+