How do I return one of my DirecTV Streaming boxes

You don’t have to return a DIRECTV STREAM OSPREY BOX since they are owned. What exactly makes you think you need to return it? Only directv satellite boxes need to be returned and even then some of those are non-returnable. 

If you bought one and then decide you are just as happy using (say) a $30 Roku instead, you may want to return the DTV Stream device for a refund.  And per their policies, you should be able to, within the small window of 14 days.  But I don't think there is a way to start the process online - so I would call them to indicate you want to cancel the order, then return the device to an AT&T company store within the 14 days.  But if it's been more than 14 days (since you picked it up or since they shipped it to you) then it is no longer returnable.

Thank you, I guess I’m stuck☹️. I have 2 that I don’t need but still have to pay $10 per month ($5 each).

thank you for your answer