legally his boss can't give you any information

I would think it was legit as no company is going to take a fall for someone (or at least I have never heard of that)

if his paychecks really aren't cut in half and they issue one saying that it is then they face huge federal and state fines

I would think that that is really what he is making right now
doesn't mean that is what he will always make
but that is what he is making now

your attorney should be able to get the info from his employer