Deleted all files but it still shows 49.1 GB of 50.0 GB used

Hi there, 

Welcome to Box Community and glad 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 if you happen to experience 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!