I have a case for sale that was supplied with a set I received recently. I chose to use a slightly larger case which would require less dis-assembly.
I believe it is what is normally sold as a "breakdown shotgun case". There is no brand name on it, but I have seen similar cases online on gun supply websites that retail for about $120.00 U.S.D. It has a thermoplastic shell with an aluminum valence, metal hardware, and foam padding inside.
The interior dimensions are:
length-34 inches. not accounting for the internal hinges.
depth- 11 inches.
width- about 5 1/2 inches with the foam removed.
I used it only a few months and it is in near new condition.
I'd sell it for $80.00 total, including postage & insurance, to anywhere in the contiguous states. (The postage alone is about $30.00) Shipping further would be cost-prohibitive. I'm in Southern California. Paypal accepted.
Photos available on request.