Key Storage?
 

Has BOA made anything to store the Ranger Keys in? I've seen a chest used in Gokaiger, but nothing for the US version. I don't want to assume that since I haven't seen one that it doesn't exist so....

Since they didn't use a chest in Super Megaforce, and the Ranger Keys were kinda just in wall displays at the command center, I don't think we'll see any storage.
The local Michaels craft store has some nice craft boxes. Some are even shaped to look like treasure chests. The actual treasure chest ones are kinda kiddy, though, so I've passed on them. But check out your local craft store like Michaels or Jo Ann Fabrics and you can find plenty of cheap boxes that'll easily hold all the BoA Keys.