What is the best strategy as for opening special delivery crates? I know there are 2 different options as for opening special delivery crates, opening 1 at a time for 100 coins and opening 10 at a time for 1000 coins. I am aiming for nightingale and the paint job for it as well as atomizer and quarker.  Which option would give more of those and why? I am not a paying user so I am currently saving up. I appreciate all helpful responses to this.