So here is what would concern me:

1. he doesn't know, and says "eh, no so much, but we wanted to be safe so we changed it"
2. He doesn't know, but says "It was pretty bad" just to make you feel like they are studs at this whole thing.
3. He doesn't know, and says so.

or

4. He does actually know, tells you how much, but you'll never know if it was 1 or 2 above.

Pick one.

Sadly the only response you can rely upon is #3.

A