So then they haven’t checked the security camera videotape or don’t intend to.
It’s not real hard to turn a belief into a fact when there is video available.
They may have check cam footage, but if it has blind spots that make it possible to exit and enter any of the lobby doors then it’s meaningless.
Their security cams (if any) may be arranged in such a way as to keep an eye on the tills rather than the lobby doors, particularly if they have an attendant checking tickets upon entry.