I certainly would not advise eating the frosted flakes inside but they are in there in case you feel like conducting some sort of a science experiment. The free poster is obviously in there as well, not sure if it correlates with who’s on the cover or not so the poster could be either Nolan Ryan, Reggie Jackson, or Griffey. You simply don’t find these boxes sealed anymore. This is a rare one! (I have carried this box carefully with me through three moves over the past 30 years)

1993 Ken Griffey Jr Seattle SEALED! Kellogg's Frosted Flakes Cereal Box Mariners.