Wayne, a reputable dealer will open the item and fully test it before you pay for it and take it home. This way if something is wrong out of the box you're not out any money. Of course, if everything is as advertised, there should be no buyer's remorse and you should promptly pay for and take delivery of the item. A dealer should be prepared to not complete a sale if the item is defective out of the box - that's part of being in business and is no different than any other line of business.
-Greg