How to reveal USB flash drive files?

Running on Maverics 10.9.3
I saved my AutoCAD files onto my USB drive a few days ago. Today, I opened my USB again and all of my files are missing. I know they're not deleted because there is used space in the USB drive.
It is a 4gb flash drive and I'm using over 5 mb of it. They're small files, no more then 200 kb each.
ALSO. I downloaded a recovery app online and it SHOWED the missing files in my flash drive...unfortunately it said i had to upgrade/ purchase the full version in order to recover it.
It has my homework in it so I need help.

IT WORKED. Thank you, my homework is found!
I did "Is " ENTER, then dragged the thumb drive to terminal and then it did that poof effect and the usb drive no longer showed in the Devices tab in Finder. I searched the name of my usb drive, found the drive, and the files were there!!
I can see my files, now there's a different situation. I have to search the flash drive name in order to open it. It no longer shows in the Devices area in Finder. How can I show it again?

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