What happens if you leave Thailand without an exit stamp on your passport?

Hi friends, I'm French and the proud holder of a DTV visa for myself and my entire family.

I first entered the country alone in September.

They gave me an entry stamp with 6 months validity.

However, I only stayed 15 days and now I'm back in France, and nobody has stamped my exit visa!

This means that on my passport, I only have the date of entry, even though I left the country via the airport.

I'm going back with my family this time, at the end of October.

Question: Have any of you already left the country without getting the exit date stamp?

I'm not worried, anyway with all the controls at the airport, they clearly know that I've left and on what date. I just want to know if this has already happened to some of you.

Thanks guys :)