Try to remember there is no longer a justice system only a revenue system. Gone are the days when police actually investigated an allegation prior to arresting somebody accused of something. Now they just click on the bracelets and let you prove your innocence.
Call your local police, explain the situation and tell them thats it's come to your attention that this property is possibly stolen and that you want no part of it, and you would like it turned over to the parties in question by the police providing the parties in question provide proof of ownership.
Get reciept for the items and then fax the miscreants a message telling them where their alleged property is.
let them deal with it