It was sealed, ah I wish I bought extra games when I was a child and left them sealed haha.
Source: https://kotaku.com/man-finds-rare-nes-game-in-attic-sells-it-for-9000-1836956281
Source: https://kotaku.com/man-finds-rare-nes-game-in-attic-sells-it-for-9000-1836956281