With the Mirror 3 and Astro booths, both road cases are custom made for each individual booth.  The road case foam inside is specially cut to fit that exact photo booth.  With that said, it is very important to insure that the tops of each road case are aligned perfectly in order to securely lock the latches in place.  If you ever experience any trouble securing the latches to these booths road cases, just be patient and take time to properly align the parts.  Attached are a few pictures of the latches that both of these booths use.  They require to be hooked and twisted in order to fully lock.