I think it's highly unlikely that Mr. Backdoor stole buzzy. It's just not a one person job. But based on that report, he did something.
However, my gut also tells me that it's probably the fact that he has tons of backstage footage and photos on his phone that implicate him, or maybe he took something else, rather than the fact that he actually stole Buzzy.
By the way, if the police ever request your phone: if you have an iPhone you can hold down the Lock and Volume down button, or you can set it up so rapidly pressing the lock button five times in a row, to "emergency lock" your phone. It will not be unlocked without your passcode and you do not have to give your passcode to the police. Police can force your thumbprint or Face ID - these will be disabled until the passcode is entered.