Hi Val -
Automated Genealogy uses the digitized census images provides by Library & Archives Canada (LAC). According to LAC there are a number of missing subdistricts in 1852 as per the following note: "The note (census records have not survived) appearing beside a Sub-district name indicates that these records did not survive and therefore no nominal index or digitized images exist."
When I search LAC for Allumettes, it indicates "Missing".
District: 20 - Ottawa (county)
Sub-District Number Sub-District Name Microfilm
258 Allumettes Missing
https://www.bac-lac.gc.ca/eng/census/18 ... -east.aspxWhere do you think you have previously searched records for this sub-district? We'd be very interested to see missing records found.
Thanks. Mark