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That is an artifact of the fuse work-around for the fact that a file under a MS-Dos file system can not be deleted (more properly: unlinked) while open (in-use).
Other than /mnt/base-us and its shadow /mnt/us, the rest of the file system tree is on a file system that does allow the directory entry to be unlinked (deleted) from the data storage while open.
The file system will do the actual 'removal' (add the storage space to the free space) when the use count reaches zero.
Any un-delete file utility is probably more reliable.
People have been un-deleting files from ms-dos storage since 1981 and some of the utilities have been around nearly that long.
It is a good thing these Kindles are grayscale - otherwise lab126 probably would have tried to emulate the BSD also.
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