The first batch of Steam Machines has been sent out to beta testers, and some have already been delivered. Of course some are already posting unboxing videos on YouTube.
Below you can check out the first, courtesy of YouTube user Corey Nelson, as he pulls out his brand new Steam Box from a rather lovely looking crate. Apparently Valve knows how to do packaging quite nicely.
As an added bonus, you can also find several pictures of one of the machines here.