You're absolutely right. The was proven when it was confirmed they had the packages, lied about having them, and only returned them after it appeared they were about to be in legal trouble.
Refresher in case you forgot.....
You don't know any of the circumstances pertaining to how they obtained said packages though. Now clearly you THINK you do but that doesn't mean you are correct in your assumptions. Someone returning a package doesn't mean they stole it nor had it at time of accusation.