Besides the BBB how do you fight claim resolution against FedEx

The only time you might have a case with Fed Ex is if you used the factory shipping box and system as they are designed to handle shipping stress. Not 100% foolproof, but you’ll be in a better position. Rarely will any of the big companies pay out a claim if something was packed “unprofessionally”.

Your only protection is a packaging that can withstand multiple drops. I found freight shipping on a pallet to be much better alternative for subs, speakers and sensitive electronics. 

@lalitk 

Good points. I like the approach by some companies (AGD) to put their electronics in hard cases. Very effective. 

Shipping large, heavy, sensitive items is problematic, and expensive, at best.  As a seller, I do everything I can think of to minimize my risk of shipping damage, which takes time and costs money, so I eventually became more conservative wrt buying/selling large stuff.  Considerations include:

• Only buy stuff that comes with the original manufacturer's packaging, and save the packaging
• Use wooden crates (e.g., like Lamm) or Pelican-type cases (e.g., Mola Mola, Khozmo, and others) in addition to other packaging as needed
• Offer large, heavy items  to local buyers only, to avoid shipping
• Second-best option for shipping large, heavy, sensitive items is to strap them to pallets and ship by freight (expensive)
• Use prominently visible labeling on the packaging indicating "Fragile" and/or "Sensitive Electronics"
• Take sufficiently detailed photographs to document the suitability of the packaging
• Have the item "professionally" packaged by the shipper, using "guaranteed/insured" services like those available at The UPS Store

Unfortunately, my only suggestion for your current situation is to persistently work FedEx's system, provide any documentation you have of the suitability of the packaging, damage to the packaging upon delivery, and/or the purchase of insurance and, if they still offer no suitable resolution, ask them what you should have done differently in this case where even double boxing was not sufficient to prevent damage by their shipping process (i.e., at what point is the shipper responsible to prevent damage to an adequately packaged item?).

@mitch2 

Very good advice. Won’t happen to me twice, there is no wisdom in the second kick of a mule.