From the transcript of Nancy Grace show on 3/21/08:

BRODSKY: No. My client, Drew Peterson, did not have any guns in his possession after that search warrant.

Link: http://www.cnnstudentnews.cnn.com/TRANSCRIPTS/0803/21/ng.01.html

However, the document for the gun transfer to Paula was the day after his FOID card was revoked (which was well after the search warrants were enforced).

I've still been banging my head around the internet trying to find out something. Is it the responbility of the person to turn over all or their weapons or is it up to the police to find them??  Can you be charged with obstruction of justice if you don't turn in all of your guns or items listed on a search warrant even if it was because the police just didn't see it? I still recall Drew or Joel saying something about this (or maybe it was just something Rick Mims said Drew said) but can't find anything supporting that.