ICloud support, customers, developers: PLEASE HELP !!

Question

I forgot to sign out of icloud.com on a computer I was using it in my friends' home. I have gone back next day to his home to check login status and he told me that he closes the browser (automatically signed out); I've changed the password and I've checked the login status to be successfully signed out from his computer.
But honestly I trust no one in case of private information [Top secret] so I'm now worried if he has downloaded any attachment in mail or in iWork files.
I just want to know how many times such a file has been downloaded [From my account] ?
Note: I've searched to my important files in his computer; I've also checked the download list and history in his computer and no one of my files found.
Did you think that because I extremely fear of my files from theft, I expect the worst possibilities became, that my friend has changed the names of the files, removed the downloaded files from list and history of his browser to prevent me tracking my files in his computer ?
Is there any action could be followed to track the activities in mail for example mail logging [date, time & description] !?
Thank you very much.

Answer 1

There is no risk in using Console (it's Terminal which is dangerous) but the viewing you propose doesn't give you history - I quote:
Apple includes an AppleScript to turn Mail logging on. Once it's turned on, the Console logs will keep track of your Mail logs until you quit the Mail application. If you want to keep Mail logging active, you'll have to re-run the script before each time you launch Mail.
(My emphasis.) So it wouldn't do you any good, and in any case there is no equivalent facility in the iCloud website. If you think that Apple have records you could contact Support and ask, but frankly I doubt you will get this from them.
To contact  iCloud Support: if you currently happen to have AppleCare, either because you recently bought Apple hardware or have paid to extend the inititial period, you can contact them here:
http://www.apple.com/support/icloud/contact/
You will need the serial number of the covered hardware.
If you are not covered by AppleCare, then - in common with other free email services - there is no free support and you may be asked to pay a fee.