Make an inventory of the items he left behind. Send him a letter that he has 14 days to contact you via text message to pick up the listed items he left behind. If he doesn't text, you through it out on the 15th day. If he texts you and doesn't make the meeting to pick the stuff up; through it out on the 15th day. As I am often in Court call my assistant Dan London at 312-807-3990 to set up a private telephone consultation. At the consultation we can discuss the confidential details we need to craft a strategic plan. These details should not be broadcast over the Internet.
This is a general answer and does not address the specifics of your individual case. To give the specific answer you need our firm needs you to come in for a consultation.