They are all over the country. The “normal” level of sealed documents, at any one time, is 1000-2000. These have been growing at 5000 per month for the last 10 months or so. Of the ones who were previously sealed and have been unsealed, 13% are warrants and the rest have been indictments. The search warrant for Anthony Weiner’s laptop was one of them.
But, hey, go back to sleep. ;-)
So then there aren't 52K sealed indictments. Some (or many) of those have already been unsealed.
And that's not to mention that some of those called "sealed indictments" are really sealed other types of documents and not indictments.
The point is, if Q is telling you that there are "currently 52K sealed indictments", then he/she/it/elemenohpee is scamming you.