Problem getting barn finds on Xbox 360 horzon 2

Hi hope some one can help me out ive played the game for over 7 hours and nearly 40% complete but still ive not had any messages about my first barn find !!
Has this happened to anyone else and does anyone know what I can do ?
Many thanks

Just keep playing. You need to venture around the map, which eventually triggers the barn finds. Make sure you pay attention to the announcement and approximate location when it is made.