I purchased a device on 06/04/15 and received it via fed ex on 06/05/2015. Does anyone know what day would be the last day I can drop it off at USPS? One chat rep told me 06/19/15, another rep recently told me that Verizon needed to have the phone actually delivered to them back at their return location by the 14th day. So im a little lost here, any help would be great. thanks!