Recently my team was moved to a tiny office, about 3x3 meters. There were 3 of us, but now an ex employee has been hired again. He was annoying before he resigned, and he is still annoying today.
I used to be in charge of music (we have speakers in the office). Most of the time we work in silence but from time to time someone asks to listen to some music. This new employee wants to listen to music all the time. He just went and unplugged the speakers from my computer and moved them to his. I leave 1 hour after everyone so I take my speakers back, only to find them the next day plugged to his computer. He can be very annoying with his music choices, the remaining 3 of us are always complaining. He's a "music worker" and he can't grasp the concept of someone needing actual silence to concentrate.
Yesterday he had a meeting. He just took the webcam from a developer's computer for no reason. He didn't need a camera for the meet. And the developer uses the computer because he is developing a video chat software. He actually needs said camera.
He seems bored. He will randomly just start talking (especially to another coworker who he is "slightly" closer with), but this person is already getting annoyed by his constant chatter, showing of memes, etc.
He also starts displaying HIGHLY inappropriate content in his computer, that he finds amusing. Just the other day he started playing a song, to the tunne of Abba's "Gimme Gimme Gimme" with the lyrics changed to "a d*ck after midnight". A couple of days before he played a video of some instagrammer who described, graphically, "how to give a ball massage". We told him "dude, that's a bit too much" and he said "haha sorry i just find these funny.. but i will make you like it too!!!".
He is also a very loud typist, and he vocalizes everything: he's constantly reading his screen and saying "eh!" "oops!" "what??". We ask him not to do that, but he says "oh, sorry, I just don't realize I do that".
Other than escalating this to our boss (who is 700km away because we're a satellite office), how can we address this with him?