Restoring Rekordbox Playlists without proper backup

I did a crude backup of a USB drive by simply drag-and-dropping the drive contents to a Macbook hard drive, lost the original USB drive so I've copied the contents to a new USB drive and I am having trouble getting the collection and playlists to appear in Rekordbox. The Rekordbox data files are still intact in Library>Pioneer but I am not sure how to apply them to the new, mirrored USB drive. Even if there is a way to recover the raw playlist information I wouldn't mind re-organizing everything manually. But of course would prefer a more plug-and-play solution as it is a lot of playlists. Other saved data like cues are less important. Thanks in advance.