It's not thaaaaaat big of a difference, until you get into hifihifi.
If you meant the casing on the lower left corner of the picture, high chances that no, it's not the guts from that piece of gear.
In Asia there's a lot of premium priced magazines (i.e. $30 in Lugia's case, no pun intended) that will have a boxed something attached to the magazine issue. Depending on what kind of magazine, it can be a reusable tote, a tool, a fashion accessory, or electrical equipment like that DAC.
In otaku/manga/anime/eroge related magazines you can get smaller tapestry, cups, towels and etc. all with special prints on them.
Nope, that would be the Lehmann Black Cube Linear with a crazy 2 gauge power cable.
Interesting. I'm thinking I'll be getting a couple of the Dengeki G's magazines at the bookstore; it seems some of them have pretty awesome extras like figurines and pillow covers and such for only 1500 yen or so!