I agree, play it! And btw it’s “Bill Collings”. The story goes that if he was unhappy with a guitar or mando or uke for any reason, he wound cut it in half with a bandsaw. Now that’s quality control!
Try light gauge 12 string set of your favorite brand can’t go wrong with DAddario phosphor bronze, and make sure you tune it down a whole step to D. Old 12 strings tend to have neck and /or bridge issues that may require major surgery by a skilled luthier.
I have an old Harmony 12 string model...
You’re lucky… could have really gotten ugly! That’s one of the reasons that whenever I ship a uke or guitar I always wrap the entire case in a sealed heavy duty trash bag before packing it in the over padded shipping box.