Both of these situations are within the purview of small claims court. Joe can file for past due rent and Tom can file demanding his possessions returned and/or market value damages for the loss of possessions.
I see this as a cohabitation and/or landlord-tenant situation in the absence of there being a gay/familial relationship between Tom and Joe. If Joe rented to Tom, Joe might have had rights to store and sell Tom's items to satisfy unpaid rent. If not in a landlord-tenant relationship, their rights and remedies would be guided by express, implied, and implied-in-law contracts and possibly equitable principles. Since you aren't a party to the grievance I am ending my comment now.
I agree with Erin's analysis. This is a matter for small claims court if damages of each party is less than the $10,000 max for small claims (i.e. less than $10K of rent owed to Joe and less than $10K of tangible personal property owed to Tom).