The Prosecution side of things seals up things for various reasons.
If Lanza is a lone wolf and they aren’t trying to cover something up then there should be no reason to extend the seal on the search warrants.
http://www.ctpost.com/policereports/article/Sandy-Hook-affidavits-remain-sealed-4150259.php
So what are they hiding
“Sedensky said in his applications that the affidavits contained information “not known to the general public” and that premature disclosure would “seriously jeopardize the outcome and success of the investigation” by “divulging sensitive and confidential information” known only to investigators.”
“Finally, Sedensky asserted that disclosure of the affidavits would “seriously jeopardize the outcome and success of the investigation by divulging sensitive and confidential information known only to investigators and any suspect(s) and also identify persons cooperating with the investigation, thus possibly jeopardizing their personal safety and well-being,” the applications show.”
http://www.countytimes.com/articles/2012/12/29/news/doc50def85374685859116293.txt
I recall knowing everything about Dylan Klebold and Eric Harris from what size underware to what prescription drugs they were on, to what music they listened to and what style of clothes they wore within a week of the Colombine attacks... and these were minors. You mean to tell me they cannot tell us anything about this adult they claim killed all these children without it compromising an investigation?
“If Lanza is a lone wolf and they aren’t trying to cover something up then there should be no reason to extend the seal on the search warrants.”
I already answered your question. They can’t know if Lanza was a lone wolf until they actually investigate that and establish it as a fact. How hard is that to understand?