We got one several years back(is it the one that asks how many bathrooms, how many bedrooms, how many people live there, etc?) and only put name rank and ss# and returned it after a VERY long time. We got a visit from some poor gal from the census office. I felt kinda bad for her when she finally left our place. Standing in the driveway in FL in August for a long time and not getting quick straight answers tends to dull ones enthusiasm. :>}
You actually gave them your Social Security Number?