I would guess that that entails FAR more work than is feasible. After all, you'd have to go into every single document, delete the offending material and then resave it and forward it to you. This is quite likely too much work to be reasonable considering the number of files you're looking at.
It also depends on what his ISP's rules were/are for things like this. It is entirely possible (and highly probable) that their policies are "If you put up content that violates IP, and we are asked to take it down, your entire website disappears." There is no realistic way for the IP techs to have the required knowledge to determine what is infringing and what is not infringing.