The alarm on your Smart Box was activated by the internal release on the lid - check the box to make sure everything is ok. You may silence alarms in Box Settings.
The Smart Box has an interior release on its lid as a safety precaution. Depressing the release will unlock the box. If you receive this notification, either a person or a package has depressed the release.
Check the Smart Box as soon as possible, ensuring that no one is inside the box and that the lid of your Smart Box is firmly closed.