As for not asking, "Where?", I believe the interviewer had just told him where, and he probably gained more information off camera between those two segments.
At 10:44, near the end of the 3rd part, the reporter asks:
"Now, they haven't confirmed - at least not with us - that it was Lauren
that they found. Are you holding out any hope right now?"
He responds:
"I hope, but... if they found it on the property somewhere..."
Remember:
- He was there that morning when they bused him and the other
friends down to the department for questioning.
- He was there the night before... looked all over with the friends, as
well as in her apartment.
- In the first segment, the reporter only said "in the parking lot area".
Don't you think that by now he would want to know "where"?
I also find his use of "it" in his response interesting.
Not "if they found her", but "if they found it".
As in, "the torso"... No one has said anything about dismemberment at
this point. So, if he's that close to her and emotionally distraught
over her apparent death (which he still hasn't confirmed), why would he
refer to her found body as "it" and not "her"?