Sauris malaca is an Australian endemic species, so not an option for Hong Kong unless accidentally introduced. I have not seen it in HK.
There are at least 7 Sauris species in HK . . .
Sauris angulosa; S. angustifasciata; S. hirundinata; S. ignobilis; S. interruptata; S. purpurotincta; S. victoriae
and probably S. marginepunctata as well.
I am not familiar with all the species. Some are difficult to identify correctly.