Hi. Possible that Charles Cramp was buried at ROOKWOOD cemetery which is a very large cemetery in the outer suburbs of Sydney. A lot of people were buried there. They do have online search engines for some denominations.
His death is registered with parents both listed as 'unknown', so perhaps he didn't have any family with him at time of death.
Link to article in Evening News, indicates he was sick for two years. Possibility he died in a hospital or institution, and the death record might have been filled in by staff.
http://trove.nla.gov.au/ndp/del/article/113737889?searchTerm=charles cramp&searchLimits=sortby=dateAsc|||l-decade=189|||l-year=1893|||l-state=New+South+Wales
The State Archives NSW could possibly hold a probate record / deceased estate record for him which could give more details. You could post a request for someone going to the reading rooms to have a look for you.
Hope this helps. Katharine.