All Images Offline in Catalog

Hi Everyone!

I started a catalog on a friend's computer and he saved everything to my hard drive. Upon plugging in the hard drive to MY computer, all of the images are offline. Since we were shooting tethered, the entire catalog contains all of the RAW files.

"Locate" is grayed out, so I am unable to locate a group of images via user collections, catalog collections or folders. The only way I can locate would be through a single image, which would take way too long.

Can anyone help please?!

Thanks,

Dylan