A golfer may deem his ball to be unplayable at any place on the course, except when in a water hazard. The player is the sole judge as to whether his ball is unplayable.
During play, your golf ball could have been moved by a number of different sources. Perhaps when you were addressing the ball, perhaps by your partner or caddie when looking for your ball.
The player must not start a stipulate round with more than 14 golf clubs. He is limited to the clubs selected for that round, except that if he started with few than fourteen clubs, he may add ...