Buy a storage unit without CS client

[brOmstar]

Hi,

 

I am looking for a way to buy a storage unit without the need to have the cs client.

 

1. What i have found so far is that you can checkout items from the shop directly via https://store.steampowered.com/buyitem/730/20074/1 where 20074 is the item id - in this example for the enfu capsule

2. I tried to find the respective id from the items_game.txt file - i found the one for the casket item 1201

But I get an error "This item is not available for sale." when I try it. Does anyone has an idea how to buy a storage unit without the cs client or has a hint what I could do?

Thank you!