In it , they documented how at one point the postman had realized that he was delivering mail addressed to more than 80 different aliases .
How investigators had discovered at his sister 's house voter registration cards under alias known to be employed by Jibril .
In it , they documented how at one point the postman had realized that he was delivering mail addressed to more than 80 different aliases , and how investigators had discovered at his sister 's house voter registration cards under alias known to be employed by Jibril .