All that can presently (June 2019) be gleaned from sheet music covers and by internet searching is that J.H. de Boos has 3 works published between 1891-2 and 1912.
Of ragtime interest is The Piccaninnies' Picnic
(1891-2) published by Allan & Co. Pty. Ltd
, Melbourne, Australia.
Surfers are welcome to contribute information about this composer.