That reminds me of Wyze Solar cam pan survives 30 ft. fall but - #7 by gmaricevic, but the Etsy listing linked in that post doesn’t really strike me as “Anti-Theft” if it’s just 3D-printed from some kind of polymer filament.
I think you’re right about Solar Cam Pan’s unusual design, too. Because of the flexible applications and the way that Cam is designed to easily clip into and remove from its included mounting bracket, locking it in place kind of defeats that feature and would likely require a bespoke solution. Even then, that leaves the SETUP button and microSD card slot accessible on the movable part of the Cam, and you can’t really lock that if you want to be able to use the pan/tilt features. Depending on the application, something like Battery Cam Pro + Solar Panel might be a better fit or at least something that’s potentially easier to secure without interfering with the Cam’s core function.