All the actual disc production will be done in specialised pressing plants in various places around the world. DVD-ROMs aren't 'burned', instead the data is stamped/moulded into the reflective layer during manufacture. The critical part of the process from Bethesda's point of view is creating the master copy from which data is read to create the pressing/moulding plates. That has to have all the game data properly formatted, compressed, validated and tested to make sure it all got included (no old-versions of files, nothing missing).
The boxes will just be standard DVD boxes bought in bulk, and the inserts, manuals etc. will be bulk printed. The discs, boxes and inserts will be brought together at a packaging plant to be assembled, shrink-wrapped and shipped to warehouses for distribution to retailers.
Whether the various bits (boxes, inserts, manuals, discs) will each be made in one place, or whether some will be made in multiple different places to cut down on shipping costs, I have no idea.
Ah, and I've never been involved in game testing, but from everything I've read it's no more fun than any other job. Painstaking, repetitive, rigorous and often highly proscriptive. Sort of "today you are testing grenades. This is an empty level. You will throw grenades at pre-marked points on walls, floors, stairs and areas of water, from different angles. You will record any instances where the grenade clips through scenery, fails to bounce properly, goes flying into the stratosphere, explodes at the wrong time, or fails to paint explosion decals on the scenery correctly. You will do this for eight hours. You might be doing it for eight hours tomorrow."
Ok, I'm sure there are brilliant parts of game testing too, depending on the company