meta box script for wordpress 3.2.2

Hello everybody. In my project I need metaboxes with checkbox list. This script is really what I need.
In the example provided by the author, the third metabox has this checkbox list:

‘options’ => array(
‘reading’ => ‘Books, Magazines’,
‘sport’ => ‘Gym, Boxing’
)

To retrieve data the author suggests to use this call:

$checkbox_list = get_post_meta(get_the_ID(), ‘checkbox_list_id’, false)

but the only thing I can get is ‘reading’ or ‘sport’ as values (not keys) and in reversed order.

How can I do to retrieve the values ‘Books, Magazine’?

Thank you.