VansMen's Mn Atwood Sneaker, Black Canvas Black White, 9.5 UK

I ordered a 12, and they are a touch on the small side. 13 would probably be too big (no 12.5 available). Do these shoes stretch?

Can you arrange a refund in case they don't fit?

Have Vans got reasonable arch support or are the flat like original Converse?

do they arrive in a vans box?