GP crate system

I don't quite understand the GP crate system. MY first question is that are all the Gp crates the same. i mean there is a 2000Gp crate, then the 9000GP crates and etc. I want to get the AUG so does that mean i can only get it from the AUG crate? also how do the coupons work. I havent got a coupon yet even after buying like 50+ GP crates. last question is that is there anyway to preserve the items you win from the crates. for example i won the flash guard for like 3 days i think, but is there anyway to preserve that item so i can use it lets say week(s) later?
thanks

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