Surely if you're so demanding of information (ie. 'i don't wanna know what your friend of a friend says') ... you could provide something more than "yellow triangle melbourne"...? What do your pills look like, what is the stamp, what dimensions are they?
The best I can help you with is information about beige coloured triangular pills in Melbourne as of this week, 10mm length of each side, equilateral triangle, beige in colour, "X" stamped on raised dome in the centre of the triangle... they test purple/black with E test, and users report a clean 3-hour MDxx experience.
BigTrancer