Either you are uneducated about HIV, have phobias, or both. Either way...HIV is NOT transmitted from environmental surfaces, period, end of story...even if someone DID "sabatoge" your razor (LOL).
If you sincerely believe that these kinds of things are "risky" in terms of HIV, then seek some professional help, as your thinking is totally irrational.
Come on...you think someone took out the razor who is HIV+ pured blood all over it then put it back in, but it looks clean and then you used it?
so you really don't think there is anything to worry about, even on the off chance that someone might have taken it out?
Seek professional mental help.