Re: 1752 warrants == 1752 people ??
Good question, and the answer is in the document under the heading "Orders modified":
"changing the description or specification of a targeted person, of a facility to be subjected to electronics surveillance or of a property to be searched"
Add to that their fetish for mass surveillance which neatly matches your post icon (or you could be a Drupal volunteer :) ), and I think the answer is "as large a scope as they can possibly get away with".
Ergo, 1752 Tier One ISPs..