1. open the store in the client
2. go to chromas / icons / emotes tab. make sure you do not own all of these + the 'show owned' box is unchecked.
3. [observe the "no items matched your search criteria" error](https://cdn.discordapp.com/attachments/229584127559467008/400778343705739265/unknown.png) / [the only option available is the mystery box](https://cdn.discordapp.com/attachments/229584127559467008/400778463998377994/unknown.png).
i own all skins + champs + ward skins so i couldn't confirm for these sections, but it does occur for the chromas, icons, and emotes.