- Oh, by the way, you just missed him.
- Hm? Missed who?
- That last client of yours, Mr. James.

9 seconds sound clip from the X Minus 1 - A Gun for Dinosaur by L. Sprague de Camp classic radio drama series.

You can hear this line at 00:23:56 in the radio play.

Quote context

[...]

- When we came out in the present, we handed him his empty gun, and off he went.

- We paid everybody off and found that we were broke.

- But quite luckily, a steel manufacturer turned up who wanted a mastodon head for his den.

- Well, we were standing in the laboratory at the university, waiting for the time chamber.

- The technician, he's a bookish chap, a theoretical temporal physicist was watching his dials and scopes.

- Oh, by the way, you just missed him.

- Hm? Missed who?

- That last client of yours, Mr. James.

- Well, that's good luck. What was he doing here?

- Oh, he told me quite a tale. Said he'd lost his wallet back there. That it contained some very valuable papers.

- It must have been valuable. He paid the university fee of five thousand dollars for the use of the chamber. He's on his way back there now.

- Back where?

- Well, he told me to send him back a few minutes before you arrived the last time. Then he could see himself drop the wallet.

[...]