Yes. We both have keys.

3 seconds sound clip from the Double Indemnity movie soundboard.

You can hear this line at 00:40:54 in the DVD version of the movie.

Quote context

[...]

- I got his check, too. I saw him down in the oil fields. He thought he was paying for the auto insurance.

- The check's just made out to the company, so it could be for anything.

- But you have to send a check for the auto insurance, see? It would be all right that way, because one of the cars is in your name.

- Open your bag. Quick.

- Can you get in the safe-deposit box?

- Yes. We both have keys.

- Fine. But don't put the policy in there yet. I'll tell you when.

- Remember, you never saw it, you never even touched it, you understand?

- I'm not a fool.

- Okay. When is he leaving on the train?

[...]