It depends upon a lot of factors. What was the sheathing material? Where is the home located, that is, what is the climate like? Rain? Snow? Arid?
What is the siding material? Can you see any of the sheathing from the inside? If the sheathing was completely dry before the vapor wrap was put on and before the siding was applied the chances are good that the sheathing has survived the abuse. I would also question other items that were installed before the building was weather tight, such as electrical, insulation, plumbing, etc.