Mail stuck at Chicago IL distribution center

Mail stuck at usps distribution center Chicago illinois

Please I will like to hear about your experience and many others here. I mailed a package to the uscis lockbox Chicago IL on 01/13/25 . Tracking shows it arrived at the usps distribution center in Chicago IL 01/16/25 and was supposed to be delivered same day. From that day there has be no update. It keeps saying in transit arriving late. It's been like that since 01/16/25 till present. I submitted a service request with usps and after 5 days , they told me that maybe it was delivered and the delivery guy failed to scan package. I'm here just waiting and being very anxious. Please share with me your thoughts.