The Cyprosterone, along with the other stuff we use as our HRT regimen would not show up in the post mortem after all that time. These drugs and hormones flush away and/or break down very quickly. That's why we have to take this stuff every day, like me, twice a day. The Coroner probably did not look at the gonads that much after his death, unless he or she thinks there are clues there to the cause of death. They look in the blood, liver, kidney, thyroid, bone marrow and other glands for the chemical clues and any physical destruction in those that could give clues to his death rather than his sexual/reproductive history. These other elective things are done when the county coroner is done with the body by an independent pathologist. A little late for that anyway. His family didn't care for that anyway, they just wanted to bury him and say goodbye. All this is, is more fodder for the tabloids.
As for the high 'Castrado', I have friends with that kind of voice and they didn't have any problems siring or raising their children. Some can do Michael Jackson impersonations. Michael did have siring problems, but that could be from any of the myriad natural things that can go wrong during his development.
This reminds me of the biographies I read of the child stars in the past were done in by their studios and managers when it came to drugs for performance enhancement. These kids did not do well as adults. The drugs and alcohol killed them in the end. As for Michael, RIP. Let us leave him alone. Just get at that Dr. Feelgood who put him down.
Joelene