The Social Security Card for Cassandra Hunt has number 552-37-1305 with a date of issue of 2/16/68. This is an actual number that was issued in California in 1975, so it was valid as of the air date. The SSN shown on the killer's wall was 651-42-2893, and it was said to belong to someone killed 12 years earlier. It too is an actual SSN , but was not issued until 2006 in Colorado, so it was invalid as of the air date.