I have the same problem. How can such a problem exist for such a long time and there is no simple user trigger for the fix.

Free users can't request support for this, terrible support actually, as a free user I would never pay having seen this simple issues with possible solutions to unresolved for the masses for years now.

I would then question, if support is bad, how safe is our data. Better avoid sensitive content on unencrypted cloud storage

Hi Vadim, 

Welcome to Box Community and I'm here to help!

We've corrected your storage count. To verify this, log in to box.com> Account Settings> Used Storage. 

Let us know in this forum once get this issue again. https://support.box.com/hc/en-us/articles/360043695334-Storage-Usage-Or-File-Count-In-My-Account-Is-Incorrect

Thanks for posting!

Thanks (:)