Thankfully it was contained to the garage so the interior of the home itself was not destroyed (although we did have to gut the drywall from the garage). 

I really do not want to be distracted by tenants who destroy a rental season for me - or my houses!

I would bet that you have no legal grounds for earning any money (you're not licensed and you had no contract with the buyer or seller).That said, I would do my best to destroy his reputation if I could...But, as I like to say, I'm very spiteful when it comes to unethical people...

Ten thousand people died -- an entire town destroyed." (12 were killed)And people call Obama an 'intelligent' president!

Also, do you tend to destroy those copies once a tenant has left and all necessary proceedings have finished (any evictions or garnishments that may have been required have taken their course) or keep them for your records?

These can often be old and rusty and a source for slow leaks that will destroy all kinds of things.It's always possible that the owner had some unlicensed contractor "fix" plumbing or electrical that you'll be stuck correcting down the road and a lot of times it's hard to find these things (even with a thorough inspection).Are you paying somebody to inspect the property or are you doing it yourself?

In other markets subsidence (where the ground sinks or rises) can destroy a home to the point where it gets condemned (yes, I have seen it happen).

He said that with the repos, people are destroying and dumping the stuff whereever...

They punched holes in drywall. destroyed ceiling fans, and stole tool. 

Again, by the time you pass, this multifamily will be a C class liability waiting for the wrong property manager to destroy it.