If Israel does not know where Shalit is located, let it kidnap a very senior Hamas person, such as Khaled Meshal and exchange Shalit for him. Time to think about such an option, even if 4 years too late. Incidentally, two of the Western hostages in Lebanon in the 80's, Terry Anderson and Thomas Sutherland, waited in captivity some six and a half years to be released, in conditions not better than Gilad Shalit. So the Shalit family should not be so desperate, especially since they received a few communications from their son, including a video. I know they are afraid and heartbroken, but there is also the national interest involved.
Venezuelan leader says Colombia plotting his assassination (AP)
from the article: Hamas: The price for Gilad Shalit will rise the longer Israel waits