No, I have not, but in this case, it may be because the faulty paperwork is not causing any problems for the homeowner.  If the foreclosed homeowner is getting their notice in the mail as required by the law, then I would imagine that it is going to be pretty hard for a foreclosure defender to see how he/she can make a court case out of the fact that the filing memorializing that notice got sent to the wrong county.  How did that mistake hurt the foreclosed homeowner?  In what ways are these misfiled notices causing problems in California?  What potential problems can you foresee that they would cause down the road? 

Who relies on the accuracy and dependability of these notice filings?  For instance, do investors rely on these notices in order to know what properties are coming up for sale so that they can research the property in advance?  Is it possible that there is some sort of collusion going on where notices are purposefully misfiled, so that some properties are less likely to attract buyers, favoring a particular insider in the bidding process?  It may be a little far-fetched, but if there was a pattern of the properties with misfiled notices being bought by a particular investor...