We recently updated our SAML SSO configuration tool in the Admin Console to support self-serve certificate management.
Since active certificates are crucial to access Box, we will now provide regular email reminders to admins when your certificates are within 90 days from expiry.
You can find more details here:
https://support.box.com/hc/en-us/articles/360055356533-Using-Self-Service-SSO-Certificate-Management