Any fingerprints were added after it left us. Had been typed on Underwood Office Electrostator, commonest model in Luna. Even so, were not too many as are importado; a scientific detective could have identified machine. Would have found it in Luna City office of Lunar Authority. Machines, should say, as we found six of model in office and used them in rotation, five words and move to next. Cost Wyoh and self sleep and too much risk even though Mike listened at every phone, ready to warn. Never did it that way again.