Let the company figure out why their inventory on this tv is down 1. If they dont contact you within 30 days you can keep it. ( FTC )
Also, what I would do is, call the place you ordered it from and ask if they have in stock the original TV you requested. If they say no, then assume they sent a better model due to TV not in stock.

btw.,,,where did you get this tv? I'm looking at buying a 27 in and hoping they send me a 46 in