about the box I mounted my EARCHI 9:1 UNUN in. It is a Hammond 1591 M. I bought it at a local electronics store years ago, thinking that I would put a RockMite in it. It turned out to be too small for that, but was perfect for the UNUN.
Not sure if the exact type is still available, but if you Google "Hammond 1591" you'll find a lot of sources, including eBay!
72 de Larry W2LJ
QRP - When you care to send the very least!