Attached is a picture of the horn installed. Where the black arrow is pointed is close to the location of the hood latch. The horn bracket is mounted with one bolt to the radiator support. If the horn is not there, check to see if the wire for the horn is still in that area. You may be able to find the horn by tracing the wire back to it if the horn was moved.
In my 2009, the horn is as pictured above. Do you think someone took the mounting bolt out, dropped the horn, and just just said the heck with it, leaving lay at the bottom? Is the mounting bracket still on it or is it a different/replacement horn?