CINCINNATI -- Well, it wasn't gold, jewelry or Prohibition-era liquor, but it wasn't empty, either.

Two safecrackers, an auto-dialer and days later, the safe at Hilton Netherland Plaza was finally cracked: Two sleeves of key cards from the 1990s were inside. Manager Jason Tyson said the cards would have been used in case of emergencies inside rooms.

Watch the opening of the safe in the player below:

The safe, a model from the Mosler Safe Company, been around the Netherland Plaza and Carew Tower since the 1940s or 50s, according to the hotel. It's not clear precisely how long it's been tucked away in the corner of an accounting storage room.

Mosler safe expert Chuck Woods has been working on opening the safe since Monday morning. Previously, the hotel tried a different safecracker and an auto-dialer to try to open it.