Hi Joseph,
I wouldn't worry much about it. Fridays and Saturdays, we just do one pick up in the morning. I would suggest you to wait for some more time.
Try calling the circulation desk, if it still shows overdue. The number is (402) 554-3206. They should be able to help you out with this.
Let me know if you need any more assistance after that.
Regards,
Reference desk
Criss Library