I'm brand new to this site so apologies in advance if I get this wrong!
However, I am a self confessed g-shock addict and have been trying to check a recent purchase out. It seems to be the same as the OP had - a DW-9500 keepers of the coast Japanese edition.
The watch and the plastic box are in amazing condition and it even had the extra packing it originally came with. The paper box is tatty. I picked it up in Japan early July
I'm hoping to find out a bit more about it and have a ton of photos.