Ouse - Stainless Steel Post Box Review

This is a neat looking, well built post box that I hope will survive the marine environment where we live. I bought this particular post box because we don't have a house name sign at the gate yet so wanted to make sure it was on the post box. I was surprised that there wasn't a name card supplied with the post box. The box for the house name is very small and when I inserted a piece of card with the name written on it had blown/fallen out by the next day. Still not sure how to rectify this problem.