[alexjm]

I've heard that the "do you not have" phrasing was used in polite Soviet-era Russian, leading to a joke about a customer who walks into a shop and sees all the shelves are empty:

- Excuse me, do you not have any bread? - Sorry, this is a butcher's shop. We don't have any meat. The bakery is across the road. They're the shop that doesn't have any bread.