If you are at STATION F : go to the Security Office and let the Security Team know ASAP.
Check out the #lost-and-found channel in Slack to make sure no one found it.
If you are not at STATION F, please notify us in the Help section in HAL ASAP. We will then launch the process to re-print your badge. Please note that new badges cost €10.
Note that badges are absolutely mandatory; not only to enter the campus, but also to book meeting rooms.