Ok, fine. It isn't the exact size of 'typical sized' briefcase, but they do make smaller briefcases.
TZ Case 8.5" Small Aluminum Briefcase Package Case PKG08
It isn't the size of an 'atypical sized' briefcase, either. It's the size of a typical pencil case, though, constructed in the style of a briefcase. You first saw the picture and thought, "It's in a briefcase! Looks like a briefcase bomb!" And even posted that sentiment here. You seem to be trying extraordinarily hard. Googling for "tiny briefcases that look like real, actual briefcases in pictures" is part of that whole "going to great lengths" that I mentioned earlier, going to great lengths to explain and excuse moronic idiocy so as to make the islamophobes in Irving, TX, and by extension yourself, not look like islamophobes. The only difference is, you jumped to conclusions based on a picture, the teachers and the police actually held the pencil case in their hand. Your conclusions can be dismissed, theirs cannot.
Regardless, the case was large enough to hold a bomb.
So is a key fob, and a matchbox, and everything else that you can put something inside of.
And with wires in it, would appear to most people that it could be a bomb.
Well, as people in general are pretty friggin' stupid, you might be right. The morons, imbeciles and idiots of the world (the US especially) mostly believe there are three kinds of electronic things in the world: Apple products, bombs and hoax bombs. But I promise you, there are more than three categories. It's possible to build something with electronic components that isn't an Apple product, or a bomb, or even a hoax bomb, as shocking as that may be some people.
Here's a good rule of thumb to keep in mind when you see something with electronic parts - it’s only likely a bomb if it has, like, you know, something that can actually blow up.
You don’t have to be an electrical engineer to just know some very basic things. Look for components that do something (LEDs, speakers, lights, displays), a power source (battery, transformer, etc) and try not to panic. Not all electronic parts put together=bomb. Your actual chances of encountering a bomb are TINY. In fact, your chances are
so tiny that unless you see something connected to wires that you know
for sure is explosive or incendiary, you can confidently conclude right then and there it is not a bomb.
The fact that the police even seriously thought about, much less discussed out loud, that they considered charging this kid with constructing a "hoax bomb" should make you seriously consider the sanity and the critical thinking abilities of those sworn to uphold and enforce the law. Using that kind of thinking requires them to arrest every teacher and student with a smartphone for being in possession of bomb making materials. No one at the school even asked his engineering teacher about the clock, even after he told them he'd had seen it. They just assumed bomb and called the police. Because... imbeciles. They acted like someone would who tried to get someone arrested for solicitation, because they believe only prostitutes wear high heels and short skits. They didn't err on the side of caution, they erred on the side of stoopid.
People who are defending that must also then defend the actions of teaches and police for the Pop-Tart gun. Because they are equally stupid and for the same reasons.