Hi Eugenia, 

Welcome to Box Community and glad to assist!

Are you looking for your owned or shared folder? If it's the latter, please contact the folder owner as your access may have ended or expired. 

Meanwhile, we have a few reminders:

• When items are deleted from a collaboration folder, both the owner and the person who deleted the item can recover the items from the Trash. 
• If you are removed as a collaborator from a file or folder that you've deleted, you no longer see that item in Trash. To see the item in Trash, you must be again added as a collaborator to that item.

To restore or permanently delete 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.
  • To delete the item permanently, click Delete.

3. At the prompt, click Okay.

Hope it helps! 

Hi! My Files also randomly dissappeared and they are not in the Trash, where can I find them or restore them?