Help. I have a boxed set of 6 filmstrip canisters (like we used to watch in school back in the 70s) with 6 cassette tapes of the Rankin/Bass animated version of The Hobbit. The filmstrips and cassettes don't look as if they've ever been used. The box is a little beat up and has library marks on it. I can't find any information on it anywhere. Anybody know what it's worth?