Hi there, 

Welcome to Box Community and glad to help! 

You will have to check your trash/bin icon to see if you can find the missing folders and restore them, especially for your owned folders. Meanwhile, for your collaborated folders, kindly reach out to the folder owner. 

To restore specific items in Trash:

The steps below apply whether you’re selecting from search results or from all Trash items.

1. Hover to highlight the row of the item you want. The More Options ellipsis (…) displays.


2. Click the ellipsis (...).  Then: 

• To return the item to its original location in Box, click Restore.

3. At the prompt, click Okay.

Hope it helps!