Trade HASH will be know only to you, when you are contacting support it will be required to solve your problems.
Just click near you Inventory, it will refresh it and you will be able to see your skins.
There are just propably skins that price is unstable, there are souvenirs or we have too many of them (overstock). We also are not accepting cases and graffitis.
Unfortunately, we don't provide to reverse or chargeback trades.