zerilli's motive is simple. he's writing a book and needs the money. >> find the remains, then i'm in a position to make myself a few dollars. >> susan joins me now from the site of is the search in oakland town-right outside detroit. the former mobs terr isn't the only one talking this tip. you've seen a lot of these searches, we all have. is there nor anticipation this time that this time really it may be it? >> reporter: well, of course, the fib is always very careful not to raise expectations here too much, but clearly this time they are saying this is a source with a lot of credibility. obviously they had to have a good bit of information to be able to -- this is someone that our law enforcement sources say is very connected over the years. in part, he gave them names, names that authorities know. one of the things this man