Macau WW2 - death certficate search

I know this site is focused mainly on HK, but as there doesn't seem to be an equivalent for all things Macanese, I'll give it a try:

I'm trying to find out how I can obtain the death certificate of a great-uncle who was a Hong Kong resident who died in Macau during WW2. Even though he was buried in HK, I'm assuming that his certificate would have been issued in Macau. 

I've tried to look on the Macao government site and on the Macao HistoricalArchives site, to no avail.

Any tips would be greatly appreciated!

GC