More comments from local gun guys:
4 - Written authorization for a family member or friend to pick them up and sell them for you.
5 - The police have no authority to withhold the guns that were not used in the crime, but the one that was is likely to be forfeit.
6 - The attorney of record would petition the court to release them for sale, either thru the attorney of record or a designated non-felon/FFL. Since the other guns wern't "involved" in the incident, should be relativly easy. Depends of course on the local DA and judge.
Well, seems to me that you'd want to consult your attorney about how to get them sold as it doesn't appear that anybody knows exactly how to go about getting them back.