Its a good idea to reset the garage door opener and the remotes. Its possible that someone has an additional, functioning remote that nobody knows about. Resetting the opener disables unwanted remotes.
The ceiling motor has a red button and holding this down does a master reset. The hand-held remotes are reset by pushing that red button again first, and then pushing the remote button, and doing this for each remote. The outside keypad is actually another remote, it has its own battery. This is reset in a similar way, the instructions are usually inside the lid, where the PIN can also be reset.
This video is a simple explanation of a typical reset procedure.
Garage doors started out simple and easy to open, but now they seem to borrow the sophisticated electronics from automobile remotes. For example, even if a burgler has a special radio that records the remote's radio signal and plays it back, the signal only works once and door will not open.
Finally, its good to have a dead-bolt. Our metal door has a dead-bolt built in.
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