Couple of references to a John McGrillis Intestate in the Qld Government Gazette 1885 which I'll try and check out.
10th Jan 1885, Rockhampton, John McGrillis, page 149.
12 Sept 1885, Rockhampton, John McGrillis, page 936.
Unclaimed letters for John McGrillis, address, Walloon Qld, 12th April 1862.
and J McGrillis, address, Langton Qld, 11th October 1873.
Gerry