If you are using Box through a browser, click on Bin on the left hand menu. You can search from there. Bin = trash. 

If you deleted it while using Box Drive on your local computer:
Login to Box on a browser and go to Admin
Content > Content Manager
Click on user name or filter to the user name
At the bottom of their files there is a TRASH folder. Click on it
Most-recently deleted files will be at the top. Check mark the ones you want then click RESTORE.

Thank you. I was using my Android phone on BOX app which I could not find TRASH folder. Thank you for support. The file is retrieved. 

Thank you Lorena