The card dispenser has a discarded card container to store all cards that couldn't be delivered for some reason:

• Because they couldn't be recorded
• Because the user didn't collect them

The maximum capacity of this container is 15 cards. When it's full, an email and/or Telegram message is sent with error code -309 (see https://helpdesk.roommatik.com/kb/faq.php?id=56).

The following video shows how to empty the discarded card container: