I have lifted the image of the bottom card from an online auction site. My card has the return portion intact. There is a short message saying 2 other cards has been sent as requested. They both have the same address and date of 27 Jan 1905 posted at Sandakan. They are therefore more philatelic than commercial use. My card also has secondary post marks of Victoria, HK and Shanghai. It would be interesting to be able to own all 3 cards which were dispatched for the same purpose.