Unless you have money to burn, you need to CYA with the AHJ. If your name is anywhere on an official document,you WILL be included in the suit when something goes wrong. Even if you prove you had nothing to do with it, it will cost you money to do so. Now, think about trying to straighten things out 10 or 15 years from now. Without fail, document to the right people and, if at all possibe, hang the bastards out to dry.