I guess the Attorney would have foreseen it by now. As per my understanding the process runs something like this:

INS and IRS are two different organizations. As far as I know, INS needs to know, if you filed your taxes or not. However, how the taxes were filed is IRS jurisdiction, and INS has no say over it.  Having said that, if you had earned millions of dollars as earnings, and if your name was tagged within the INS system for some reason; then they could go back to IRS and ask for an audit. As you can see, this can happen only on a case by case basis.

Again, I could be totally wrong, therefore its best to check with your attorney...