Would there be a high chance of match fixing due to no crowd? Just a thought.
Match fixing chances does get increased or decreased due to crowd. Even if people do not watch the match live in person, but they can watch it live on TV or later recordings on you tube, so there is not much difference.
I agree, there were rumours before, but it was long time ago and I doubt that there are prevalent today, specially high profile fights. It's really hard to fix it as there are huge money involved and I doubt that everyone involved are to be willing participants because sooner or later it will come up in public and it will affect them negatively as boxers.
And boxing promoters are eager to see the boxing go to make money here, so it doesn't make sense to think about fixing the match with or without the crowd.