You only have one opportunity to get this right because once the divorce is finalized you really can't go back if you then figure out it was different. But it's a gamble. My attorney told me that this type of disclosure is a crap shoot. Normally you pay a lot and don't get anything out of it. But the peace of mind might be worth it for you.
In my case, during our marriage, my ex had been telling me the value of a farm we owned was a certain amount. At the time we were getting divorced he listed it for about 1/2 as much (it was his say so, no appraisal). So it cost me $350 to have it appraised and it came in very close to what he had said in the divorce papers. I did not feel it was a waste of my money, because at least I had peace of mind that what I was settling for was correct.