years ago the misses sent me a letter that contained an important document, I waited and waited for it, months later she got the letter back , the royal mail returned it 'address unknown', because she got the house number wrong, she missed a digit off it, but my surname ( only a few people in the UK have the same surname) and the post code was correct
Dave you should have put your card in a small box with some chocolates and used a website like ParcelHero, they use the major couriers at a discount and she would have got her card and chocs in about a week or so