I don't really think that they're trying to break Tor like this. More of a thought experiment - to figure out the likelihood that this is part of an attempt to break Tor, run through the details of exactly how this would be part of such an attempt. It doesn't sound all that practical when you run though how it would work if it was. If they wanted to do it, you'd think they have better ways then a rather sloppy attempt to intercept a laptop keyboard shipment, if that's actually what this was, instead of an ordinary shipment screw-up.