This is a case I had custom built by a company called Badger Case in Saukeville, Wisconsin about 2008-2009. It was used to ship large mounted photographs from a lab in Seattle I used at the time by freight to me here in Indiana. Maybe 3-4 times only. Since that time they have been in my studio functioning more as a table! They are powerfully built, sturdy, with a bit over 1" dense foam lining the inside. You are more than welcome to come see in person.
Price is $520. I have asked Badger Case for recommendations on an adhesive to re-attach some of the foam walls to the box structure. I will provide that adhesive for you when I get their recommendation.
Outside dimensions of the storage shipping container are 76" long, 16" wide and 40" in height. Inside dimensions are 73" long, 13" wide and 36.5" in height inside.