You have even less of a claim against the retailer than the OP.
Best Buy did not pack the television sets. YOUR claim is - or was, it's way too late now - most definitely against the manufacturer.
No retailer is responsible for the condition of the roads over which delivery vehicles travel, whether the vehicle is owned by them or by the manufacturer or by an outside contractor; and to the best of my knowledge, the smooth concrete flooring in retail warehouses and stockrooms, and the smooth tile floors on the selling floor, minimize or eliminate any assumed "bouncing around".
Not according to Consumer Reports. It may be less convenient to deal with the manufacturer than with the retailer, but given the low opinion many consumers have of many retailers combined with the relatively high cost of such plans and that the item generally should last long enough and any repairs after the basic warranty expires should cost little enough - extended warranties are not a good expenditure.
Best Buy packaged nothing - the manufacturer (the company that made the item) did the packaging. Stop buying products made by that company (and its subsidiaries, and its parent company, and any other retailers for which it may do private label packaging). Place the blame where it belongs. Why in the world do you think Best Buy packaged ANY product?