Just wanted to step in and clarify something Izret pointed out, but "preorder" bonuses tend to be Extra Media if they were things like soundtracks and posters. However, if it's a stand-alone game like the demo pointed out earlier, it should have its own entry with the attached Trivia about how it was available.
In the case of the Employee Kits, if they don't have any software with them (just swag bundles), they should likely be Extra Media. We DO have Press Kits in the database that came with software, but the important part to that is that they had software and weren't just swag. We are a VIDEO GAME database, after all.
Speaking of, I just got a Review Kit for Tiger Woods PGA Tour 13 and it came with a retail copy of the game inside it.