I acquired a Kato C&NW 400 set of gallery cars and E8A locomotive, as loose items. I am rummaging through eBay and KatoUSA to find a suitable bookcase box to hold the set. Trouble is that they are identified by a letter code, C D F N and so on. None are obviously correct to hold my set. Buying one to try it and returning would be weird because most of these sellers are located in Japan. Any advice on which Kato blank bookcase is close enough?