it is looking suspicious to me
It's no surprise that the phones would be off, they are after all used solely for business. And if no one is working then there is no reason for them to be on. Plus both of them had holidays scheduled, I'd bet my bottom dollar they will be back within the next few weeks. And hopefully at a better location with less intrusive neighbours.
But I am a little concerned by all of this, they were pretty much the only reliable people I could afford to see within walking distance of me and as such I have grown to be pretty fond of them. Plus the police thing was more than a little frightening.