Honestly I don't know. This was investigated once back then, and it was investigated this year when the Yankees said we were cheating and both times MLB found nothing.
Of course that doesn't mean it didn't happen but I find it strange that Mike Fiers didn't have a problem with it while he was an Astro
and suddenly "grew a conscience" now that he isn't (and went to a rival AL West team) and 3 "anonymous sources" are meaningless to me.
There aren't any whistleblower protections in MLB so put your name on it if you accuse someone of something.
If they are players and/or managers, they are afraid (and rightfully so) that this could ruin their careers.