CAPTBEACH:
I'm having a good laugh at the responses you've gotten so far. You have found a fantastic machine package that would serve you very well IF you learn to use it. There are 8 coils in your photo. Those dual coils were used to hunt with the larger; pinpoint with the smaller, inside one. Those 2 reeeeeal small coils on the right end were sharp shooter coils for working close to metal objects such as fence posts, playground equipment, etc. Yes, those large coils, especially the 2 on the left end, were for cache hunting as well as gold and silver VEINS. Did you get that?? VEINS. In addition, they can detect old trash pits and outhouse pits that have at least a little bit of metal thrown in.
Some have said you'll have trouble searching mineralized soil. Bulls---. You tune the machine to the mineral side and when a metallic item is scanned, the sound will drop out or null; even coins.
Were I you, and just HAD to sell that package, I would not let it go for less that $350 plus shipping. And, do NOT piece out the items. If you decide to sell, sell the package as a whole. Don't let someone talk you into selling one of the coils separately. I have a basic Garrett's BFO that I bought about 3 months ago off of eBay that came with 2 dual coils that I wish had come with at least ONE of those large coils. Those coils are not available anymore except from private individuals.
If you decide to put this package on eBay, please PM me and let me know because I'll certainly bid on it. As I've already stated, were I YOU, I would not sell it. I would use it for it's specialized uses. Charles Garrett, himself, used those machines with the larger coils, for searching abandoned gold and silver mines for veins "hiding" in the walls, floors, and ceilings of the tunnels. Searching for veins of COPPER and lead would also fit the use. There's a "lost" copper vein running just under the surface of the ground in a certain area of Oklahoma that would fit the bill for this equipment.
Karl von Mueller wrote a book specifically for this machine. It's title is
Master Hunters Manual , published by RAM Publishing (owned by Garrett). He did this at the request of Charles Garrett because Garrett knew KVM would detail everything, good and bad, about that machine. I have a copy of that book, and before you ask, nope, not for sale.

I've given you just a couple of different uses for this equipment and just thought of another. Those large coils have been used in looking for tunnels and mines from the surface of the ground. If the detector is adjusted to the mineral side, the tone will drop out or null when the coil is passed over the void of a mine / tunnel.