I have.
3 seconds sound clip from the Beat the Devil (1953) movie soundboard.
You can hear this line at 01:30:44 in the Blu-ray version of the movie.
Quote context
[...]
- Did he say anything about romantic attachments?
- No. I should have been very surprised if he had done.
- Mr. Vanmere struck me as being every inch a gentlemen.
- Well, that's all, unless somebody has anything further to add.
- I have.
- You ought to know that the business of one of these businessmen is murder.
- Major Ross, I mean. I can't guarantee that Major Ross murdered this Vanmere person.
[...]