R' Yaakov Roza, the Rov of Zaka [that takes cares of Jews killed in terror attacks] and of the pathological ward for refuah mishpatit in Abu Kabir [where bodies are identified and legal issues related to the death are sorted out] related that he saw the corpses of the three boys and although they had been dead for 18 days and buried in the sand - HE FOUND NO SIGN OF WORMS OR ANY DECAY. He said he has never seen anything like it in his life and the doctors said that they have no medical explanation.
[Sod Hachashmal page 8]
זכות הקדושים יעזור ויגן ויושיע