I have no doubt it is copper, destined to be installed on a McMansion in a gated community, which still does not insulate the people from the thieves though.
Things got so bad around the FT. Worth Dallas area for a while that scrap yards started issuing picture ID's to persons selling, this in addition to requiring your Tx, DL. If you showed up with a trailer load of any new copper such as pipe wire or sheeting you had better be a contractor in the respective trade or the police would show up before you were unloaded, long lengths of used wire or pipe and sheeting also would get you questioned. Same thing with large quantities of aluminum, any new materials brought into the scrap yard was an immediate red flag.