I have never found that an .mbp file is required. If you copy a .mobi file to the Kindle, there is no .mbp file until you open the file. Maybe a permissions thing is causing them to not appear on your Home Page?
Edited to add: Are the files the right size?
I would remove the "echo" command from the script.
The charge is rounded up, per download, too, not cumulative. So, if they decide to charge you (since you are abusing the Whispernet privilege), every upload would be 15 cents (it's 15 cents per megabyte now, not 10).
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