Flat screens are sent on pallets. When they are take individually and shipped they are top heavy. Many dealers ship to distributors who ship with private shipping companies under the guise of 'white glove' delivery service. If your stuff is coming from fedex or ups I pity you. Unless you are getting the tv you want with an extended warranty AND several hundred less than what you would pay at a bricks and mortar retail store - I would not recommend it.
ONTO YOUR ISSUE though!
The one thing you can do is to check to see if they removed the box and added 'center support'. Most flat screens are shipping with two bottom foam pieces that hold the tv in the base which is usually 1/3 the box height. The top piece of the box goes the whole way to the floor over the bottom box and two foam pieces are placed at the top of the box. This creates a soft crate for the box to ship, but because they do not put foam in the center, it is subject to damage when shipped individually if someone leans into the center of the box or while moving the box around stairs etc - or even shoving it onto the truck, turning it and hitting the corner of another box abruptly into the center of the tv box.
Also these boxes are a bit topple prone. So a few pieces of center support that will disperse energy from a hit away from a point on the screen to a piece of foam covering the general screen area will be helpful.
All of this is a moot point however if you find that your box was opened and there was nothing special done to it.
You should find that most of these boxes have little plastic 'tabs' on the bottom that you squeeze and yank out to release the top part of the box, AFTER the band straps have been cut. If your tv is shipped with this type of box and there are no band straps on it, you should worry that it was returned and carelessly reshipped. I doubt this will happy though so don't worry about it until it happens, which it shouldn't.
Like someone else posted, there is a thin foam 'blanket' that covers most tvs. If this isn't included then again, concern that it was a redo. Check with others that receive the same tv to see what kind of packing they removed too. Different manufacturers have different techniques.
Also, I think I noticed that VIZIO doesn't use this method, they use the old fashion staple method and have the person lay the tv on its side and slide it out, at least the one I looked at had this method. All the others had the carton methods I mentioned above that were sold at Costco.