You are looking at an official  MICHAEL JACKSON  CASSETTE LONGBOX TAPE 

SEALED BOX SET. ONE OF THE RAREST MJ CASSETTES IN EXISTENCE. CONTAINING MANY REMIXES UNAVAILABLE ON ANY ALBUM. CONTAINS AN "S" STICKER ON BACK.

When CD's were introduced in the 80's the came packaged in these long box form packages with gorgeous big artwork and cases. In the early 90's longbox CDs were deemed a waste of paper and packaging. So they destroyed and removed all of them and replaced CDs as they are now with no box and no packaging.

LONG OUT OF PRINT and VERY COLLECTIBLE. You will rarely see these beautiful cases. 

SEALED AND IN VERY GOOD CONDITION FOR THIS UBER RARE RELEASE FROM 1987