Flying through the US with a 7 hour layover at DFW on Sunday.

I'd like to order some things off eBay, but where at the airport can I have them sent so I can collect them on a Sunday?

FedEx office in the Hyatt is closed.

Is it ok to use a hotel without a booking. Happy to pay a collection fee.

No where so far I have to get a ride out of the airport. I'm to anxious for that and the stuff I'm ordering isn't worth it.

Thanks