Returning Uverse Equipment

I cancelled my Uverse TV service.  Went to the Fed Ex place to mail in equipment as instructed by AT&T.  Fed Ex would not accept the Wireless Access Point piece of equipment (which was one of the items I was instructed to return).  They said that there had been a problem with them scanning that piece of equipment and their system/AT&T's system not recognizing and then customers were being charged the $150 non return fee.  I have called customer service (oh boy what a fun experience that was) and asked for an address so I can send the WAP to AT&T.  I have 21 days from 5/1 to do this.  They are supposedly sending me a label.  I am nervous I won't be able to return the equipment in time and thus be charged $150.  This whole AT&T experience (Edited per community guidelines).  I have been a customer at current address for 5 solid years.  Never again.