I've inherited a unique item or should I say a pair of items. I'm a fan of early Genesis and in particular The Lamb Lies Down on Broadway - a friend gave me his 2 LP set - It appears to be part A and part B of promotional LP vinyl for the Lamb Lies Down on Broadway tour. These are unopened and the packaging is pristine. I was wondering what are these worth and what is the most sane/safe/effective way of selling them? Thank you in advance.