The Amulets are def not server sided since they added an update recently that lets you find them in chests, and so I doubt the bullet coins are too. Hopefully someone will soon give us some cheats on messing with the amulets/bullet coins because I see a lot of players in this game with way too many expensive amulet outfits and I don't even know how on earth these people got so many legit unless they spent a lot of money or all got super lucky. I already tried but it's too advanced for me since I keep getting UE4 errors, I'm not at the skill level to deal with UE4 anticheat measures.