Honestly - when the position doesn't necessarily call for something, I don't think anyone necessarily exudes it.

I never thought I had managerial skills until I was managing shifts - and neither did my manager. I wouldn't call them little white lies... I don't know.
Honesty is great, and if the boss knows you then maybe it's worth being straightforward and saying that although you have not demonstrated it in the past - that you look forward to the opportunity to prove yourself?

Not much help am I? Sorry! Just had a thought and decided to babble. Good luck anyhow!