To summarize what I have gleaned above, not to claim originality:

You and sinsull are on to something here, to be taken into consideration with previous observations about bullies. You have to let them know how it is, so do it with quiet dignity. Not wanting to live there in their presence does not need to feel like cowardice or flight. Make adequate preparations for protection of property and person, knowing that property is at risk and but that only threats against person are likely. Let the cops (and leasing agent) know in advance of disclosure what your situation is, and perhaps let them know about the disclosure date. (Is it possible to have an off duty cop on stand by for disclosure evening, to make a polite appearance only if necessary? Perhaps that note about the computer will serve as independent evidence of your true situation.) Then hopefully leave the possessions there even though you are gone? Photographed, catalogued, and spirited out as feasible.

If these guys know that the cops and the leasing agent are expecting trouble from them, and your small army takes out the most prized possessions on disclosure day, you should be entirely safe and your possessions should be reasonably safe.

So sorry about scum. Good times are coming. (In my opinion you should impose on your son as much as possible here, btw.)