If I understand the Gemoro correctly (bottom of Shekalim 17a), before Yechonya was taken away to Bovel, he threw up the keys to Shomayim. My question is that the Beis Hamikdash was not destroyed for another 11 years - did they not need the keys till then? (If they have another set, what was the point of Yechonya throwing them up to Shomayim!?)
Meir Eliezer Bergman, Manchester UK
It seems that the doors were left unlocked (although they were still guarded by the Leviyim).