His funeral was reported on page 7 of The Hong Kong Telegraph, 1930-09-08:
LATE MR. WILLIAM GARDNER.
REMAINS BURIED IN ROMAN CATHOLIC CEMETERY.
The funeral of the late Mr. William Gardner, who died at Shanghai recently, took place at the Roman Catholic Cemetery on Saturday, the remains having been brought down from the North for interment.
His Lordship the Bishop (Mgr. H. Valtorta) performed the last rites with the assistance of the Rev. Father G. M. Spada. The chief mourners were Mr. and Mrs. W. F. Gardner and Mr. and Mrs. J. Gardner, Sister John and Sister Rita, both of the French Convent, Miss Gardner, Mr. R. C. Silva, and grand-children.
Amongst those present were the Hon. Mr. J. P. Braga, Mr. A. F. B. Silva-Netto, Chev. J. M. Alves, Mr. V Soares, Mr. H. Figueiredo, Mr. F. M. Graca, and Mr. M. Botelho.