a mystery

Today, we had quite the odd thing happen. There was a knock on the door during lunch when Amadon was home, so he answered it. A guy that seemed familiar to him handed him an envelope and told him that someone had asked him to give it to us. It was just a plain white envelope with his name typed on the outside. We opened it and there was a $50 gift certificate to Hugo's. We tried to catch the guy to find out who gave this to us but it was too late. So we thought of every single person we could have and we're stumped. The other odd thing is that the typing was done by a typewriter. Who even has one of those anymore that we know? It was very kind, generous, and we are grateful.