Some other embarassing success story. My gf bought a postcard in Czech Republic, filled it with my address in Warsaw, but forgot to buy poststamps. She didn't

Some other embarassing success story. My gf bought a postcard in Czech Republic, filled it with my address in Warsaw, but forgot to buy poststamps. She didn't send the postcards and carried them to Warsaw. In Warsaw they fell out of her pocket on a street, or something like that. Still, they arrived in our post box. We still don't have an idea how and why :)