Personally, I would feel uncomfortable keeping something I didn’t order but I don’t believe you have a legal obligation to send it back - moral obligation, maybe.
However, Infinity has more lawyers than can fit in the Eisenhower Rec Center so it’s doubtful they would make a stupid mistake. I’m sure, somewhere in the papers you signed, you gave permission for them to send you stuff and if you don’t want it, you must return it or be invoiced.
Just to be safe, send it back.
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