Don't know much about Cardiac but I just finished reading #6 last night and I'm a huge fan of this run so far. It's definitely making its way to the top of the pile each month. My only complaint would be the art which I'm not a huge fan of....but that's a personal choice I suppose.
I think the intent of the SDB was to show where he is at emotionally and mentally, not a literal contents of the box itself. I think you are waaaaay over thinking things Tony. This scene never even crossed my mind until I read this rather lengthy and unnecessary article. IMO.