Lost trade in

Usps lost an s23 i shipped to xfinity on June 18th 2026. I cannot receive credit for my trade in due to the fact it has not been recieved . I have tried contacting usps and filing a lost mail claim to no avail. I have also been on the phone with xfinity representatives multiple times with no resolution. I am asked the same questions each time I am on the phone . I have provided the tracking number from usps which shows the package arivving at a Texas facility on June 30th. As of today it still shows in transit. I understand xfinity is not responsible for lost mail but I feel I have been wronged . I cannot contact the post office about the package directly so it seems I am out my trade in and the phonee I sent in . At this point I do not know what to do about the situation. The representatives have been helpful on the phone but they always come back with the same ...I will escalate this ticket and I will recieve an email or call back for further info. I never do and I end up calling back and getting same result. So this is more of a comment made out of frustration. If there is any chance someone here can offer some advice ill be happy to take it.