I told my ex he couldn't come home after rehab, and he flew halfway across the country to his parent's home. While he was still in rehab, my mom flew out, we packed up as much of his stuff as would fit in his SUV and she drove it back to our hometown. (Partly as a reason why he couldn't come back.)
There were some large pieces of furniture that were special to his family and some things he was awarded in the divorce, so I packed it all up, and shipped it to him in a pod. It took a long time, mostly because I took the shipping costs out of his alimony and am still waiting for him to accept that it's over. But anyway, just piling it all in a corner of the garage was a start.