A Japanese ship is on a mission toward United States. Just before the destination, the captain decides to take a shower. He kept his wallet and diamond studded gold bracelet on the shelf and goes for a shower.
When he returned back, he found both the wallet and bracelet missing.
He immediately called the four crew members and asked them what they were doing during that time.

Following are the answers:
1. The Cook: I was in the kitchen, making bacon sandwiches for everybody.
2. The engineer: I was in the generator room, checking the generator.
3. The housekeeper: I saw that the flag hoisted on the ship was upside down, so I went to correct it.
4. The second housekeeper: I was tired and taking a quick nap.

The captain immediately identified who the thief was. Can you tell?