These tapes appear to be in good condition, some missing sleaves and some cases have cracks! They are as is! Never tested!!! Please view photo's before bidding! Yes there may be duplicates and as I can tell all original tapes!!! This is less than $2 a tape, and some are valued at $15 to $20 for 1 cassette!! They sold for $5 a piece in my shop! Thanks for looking...