You are correct. It WAS lost for a while.
(My take is that is was saved by GOD to be revealed later how BOGUS MORMONism is.)
I totally agree. God has left Mormons without excuse. When one of your sacred texts is shown to be completely false, how can you trust in any of the others? The Book of Abraham papyri completely shatters any credibility that Joseph Smith had to anyone who looks into the issue.
Is it any wonder that Joseph Smith could be later fooled by the Kinderhook Plates?