Basically, the game was opened very carefully to ensure that the original plastic wrap and tags are still intact. I have a few and the value has not been established. Some say a normally $50 CIB game is worth over $200 because it still has the wrapper around the outside of the box (with original hang tag and price sticker).
here are a few ebay listings that are examples:
https://www.ebay.com/itm/Teenage-Mutant-Ninja-Turtles-NES-1989-Open-Factory-Seal-C-I-B-/165088350351?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=711-127632-2357-0
https://www.ebay.com/itm/hangtab-Golf-complete-nintendo-nes-5-screw-black-box-opened-factory-seal-MINT-/133896627648?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=711-127632-2357-0
Basically, the game was opened very carefully to ensure that the original plastic wrap and tags are still intact. I have a few and the value has not been established. Some say a normally $50 CIB game is worth over $200 because it still has the wrapper around the outside of the box (with original hang tag and price sticker).