Help❓ Battlepacks

Hi!
Any1 knows how to crack them, of how to get many coins for them. In standart battlepacks many times getting shit, I wanna buy battlepacks for 900 coins

P.S. Sorry for bad eng, I supouse, u will understand

lol this work only for skin and boost and puzzle?
I have only this in the Battlepacks...no gun ... or other thinks