First time playing RE2 and I didn't know I get pick the shotgun off of Kendo. I'm at the first boss and I don't have much ammo except for the shotgun. But I can't find the shotgun itself. Can't go back to Kendo's to get it and I can't find it in the west office. I checked the locker and I just got handgun ammo. Don't know what to do because I don't have enough other ammo to kill the first boss.