The Commonwealth War Graves Commission website which lists the details of Henry Coopey states of KORTRIJK (ST. JAN) COMMUNAL CEMETERY
'There are now 221 Commonwealth servicemen of the First World War buried or commemorated in this cemetery. 11 of the burials are unidentified, and there are special memorials to more than 30 casualties who died in 1914-15 and were buried in the Germans plot but whose graves could not be found....
Courtrai (now Kortrijk) was in German hands for most of the First World War.'Therefore it would seem the records for the burials would only be German records and I'm sure the Commonwealth War Graves Commission did after the First World War try to identify the whereabouts of the 30 British casualties buried by the Germans amongst the German graves. The information does appear to state that Henry was believed to be buried in the cemetery, so the CWGC must have found some records to that effect, even though they were not able to pinpoint his exact grave.
COOPEY, HENRY
Initials: H
Nationality: United Kingdom
Rank: Private
Regiment/Service: Gloucestershire Regiment
Unit Text: 1st Bn.
Age: 18
Date of Death: 28/01/1915
Service No: 9733
Additional information: Son of Henry and Esther Coopey, of 35, Morton St., Gloucester.
Casualty Type: Commonwealth War Dead
Grave/Memorial Reference: Sp. Mem. 28. Cemetery: KORTRIJK (ST. JAN) COMMUNAL CEMETERY
Have you contacted the CWGC? Really if they don't know, nobody does - that after all is what they do and what they were established for.
http://www.cwgc.org/Regards
Valda