He was caught using two fake reactions, and he owned up to those. But we can’t say if the others are real or not with any certainty. Personally, I thought the parking garage reaction looked like bad acting as soon as I saw it, so I’m still skeptical.

He also initially claimed the package was placed in Illinois, but he edited the video after people called him out on it.

And he presents the device as something he engineered himself, only briefly mentioning that someone helped him. Another video shows that the other guy, Sean Hodgins, actually built it (find the link in jtokoph's comment below).

So who really knows? It wouldn’t be the first time something on the Internet was staged.