As LCC suggested, I would use "find". However I would start at root, on the off chance that it ended up somewhere strange outside of your home directory.

sudo find / -name Folder1 2>/dev/null

(redirect stderr to /dev/null so you don't get spammed with complaints about devices and such)

As LCC suggested, I would use find. However I would start in the root of the volume, on the off chance that it ended up somewhere strange outside of your Home directory.

sudo find / -name Folder1 2>/dev/null

The 2>/dev/null portion of the command line redirects stderr to /dev/null so you don't get spammed with complaints about devices and directories you don't have permission to access.