Up here insurance is now 2 dollars per hundred with a max insurable amount of $1000 IIRC. So yeah obviously stuff gets trashed ALOT!
If you care about it over pack it. Long thin packages that are light enough get javelin-ed (union postal chimp's description not mine)
As for price an equal volume package does not get much more expensive as it gets heavier. for example I just punched some figures into the postal calculator and a 2 pound package 3 feet by 1 foot by 5 inches costs $28 dollars to ship the same box with 20 pounds in it cost $34.
That price spread would only buy 300 dollars of insurance! What can you fix on a long rifle for 300 dollars?
So obviously why not make the box heavy enough to demand respect? 4/4 pine, 3 inch iron nails and a nest of DOW pink foam. A nice gun has how many hours in it?
Berkuta has it right. Wish everyone showed that much respect. Especially the last vendor that sent a 300 dollar lock, plug and sundry items loose and unwrapped in an over sized carton.