This is why you'll make a great lawyer one dayThey aren't well known for doing the right thing. Or caring about people. As long as they profit somehow.
I'll be sure to remember this if anything happens to go missing in your collection. We won't sympathize with you at all. We'll just pat the guy on the back that stole them from you and tell him: "Good job, man! You're getting a heck of a deal! What, that guy? He just paid for them. What a sucker."
Also: I know several people that are, in fact, in Law School. From the sounds of it, you have no idea how to approach a 'case'. Reporting suspicious activities to the police is not asking them to come and take the animals away. It is making them aware of the situation in case the rightful owner files a claim with the police. Then the owner and the person who bought them can be put into communication, the owner can get their animals back, and the man who stole them (if the contact information remains valid) can be charged.
How is that not a winning situation? Because the guy doesn't get a sweet deal out of someone else's loss?