Is i3lock saving information about failed unlocking attempts?

My version of i3lock is 2.7 (2015-05-20). I checked the manpage and there is -f option to show the number of failed unlocking attempts:

-f, --show-failed-attempts

         Show the number of failed attempts, if any.

It prints them on locked screen inside the unlock indicator, but I don't see any option to print it in console or output it to file. I want to get emails every time somebody tries to unlock my computer, and I need to pass every unlock failure to a script.

Are failed attempts kept in a file or are they accessible in any other way?

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