I have a 2010 3455SA. If it is the same as mine, I just pull it out with my fingers. It is a wood frame with cloth attached. First time you might have to use a knife to get it started. It fits tight but was not attached.
I have my satellite receiver, hard disk and center speaker sitting behind it. I moved the left and right speakers mounting them underneath the shelf outside the cabinet. I used a free standing wire shelf that I bought at a housewares department. I secured it with Velcro strapping screwed onto the shelf, both side to side and front to back.
Hope than helps.
Ken
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