My new Celine Grey Croc Phantom

What do you think?
Do you know why this bag is slightly more expensive compared to the other bags with single colours?
I personally thought the leather was tougher and harder whereas the single colours Phantoms has softer leather which may loose its shape in time...
Hi, im new to this forum and would love some assistance on how do I proceed in getting ny celine croc authenticated....please someone help the new girl :-/