A slightly different edition of the game was released the same day in a large box with a GunCon2. The barcode and catalog numbers are different.
It came with a manual, an advertisement for the Gold Lugers, and a survey/ registration card.
4. Front of manual
5. Back of manual
6. Front of Gold Luger advertisement
7. Back of Gold Luger advertisement
8. Survey/ registration card
Thanks to OGDB (image 3) and Bigmanjapan (images 4-8).