John Mull Big Winner Of 18,000 - Three-year-old John David Mull yesterday arrived at Armco Park too late to take part in the special Easter egg hunt for pre-school children. But, undismayed, the son of Mr. and Mrs. John Mull, 3203 Illinois Ave., jumped into the big-time competition for older boys and girls. With the aid of a persistent father, John David on his first egg hunt uncovered a tile lying on a hill and pulled out the grand prize golden egg, worth five dollars. The egg had been hidden by Patrolman Lawrence White, who, while perched on his white horse at 3:30 p.m., pointed to the hill and informed thousands of youngsters, "This is the place..."