I have heard that if after you receive something from UPS or Fedex, and there is an operational problem, like a buzz or noise, from dropping or jarring the box, UPS will not cover it. My understanding is that there must be viewable physical damage to the unit and the box. If the box is intact, and some internal components end up malfunctioning from the jarring or dropping they do, you are out of luck. That pretty much sucks.
Some Tips on UPS claims
Having just gone through the ordeal of a ups claim, I thought I would pass along some tips for my fellow audiogoners, 1. ups at first will always deny the claim, usually insuficient packing, 2. you must have original bill of sale for merchandise showing price, 3 only the sender collects, so if you are a buyer, try to work this arrangement out with the seller in advance of shipping in case there is a problem, 4. don't insure for more then the original receit of purchase, you won't get it, and finnally, be persistent, you will have to deal with several people to finnaly get it done, and it will take awhile, at least a month, I hope this helps !