Sent in trade in device.

Hello. I mailed my trade-in device to Xfinity but USPS tracking shows the package cannot be delivered and it is stuck/delayed. I followed all the steps I was provided by Xfinity with

The usps tracking is [Edit: Personal Information]

Message showed on USPS tracking page: 

This is a reminder to arrange for redelivery of your item or your item will be returned to sender.

Can Xfinity contact Assurant to arrange for phone pick up? 

I need assistance with this as I don't want my phone to get lost and not receive the credit for it. 

Thanks.