Sorry I’m having difficulty understanding your post. From what you posted, you had 2 blood examinations on separate occasions. The blood count showed slightly low white blood cell count (wbc 3.1) but it was normal in 1987 (white 7.2).
Repeated exposure to benzene is one of the risk factors in the development of leukemia.
Did you have other examinations done aside from complete blood count? Perhaps you should have a peripheral blood smear done also to see the cell morphology. Also, it would be best to consult your doctor for further evaluation.