It's so easy to make matching boxes for cards with depth using the Scoremaster or it's big Brother which is A3 size. You can create the box and lid to fit perfectly as below.
I made this one from 2 pieces of A4 card cut to 8 1/4" square and scored at 1" all round.
It's decorated using elements from Sara's Shabby Chic Collection, the same as the card inside.
It's a fabulous way of protecting the dimension created on a card too.