The Case of the Netherland-Sumatra Company, authored by Jack Grochot, is found in the Sherlock Holmes Megapack, an e-book published by Wildside Press. They also publish SHMM, the Sherlock Holmes Mystery Magazine, where more of the author’s pastiches appear in several issues.
“The Case of the Tarleton Murders,” by Jack Grochot, was recently published in Sherlock Holmes Mystery Magazine #10. This edition also features stories by Zack Wentz, Peter Cannon, Carole Buggé, Mark Wardecker, Darrell Schweitzer, Martin Rosenstock, and Adam Beau McFarlane.