Tablet: It was probably an old one, in a box in storage. Don't you have any old outdated electronics in the house?
Cam: It wasn't long after the crime, it was the day of the funeral. Sounds pretty standard to me.
Neighbors: If I hear gunshots I might note it, but wouldn't even glance at the time. That's life NOT in the big city. If I hear sirens nearby I'd wonder what's going on, because that IS unusual here. But if they're more than a block away I might not hear them in the house. The neighbors might have had on a radio/tv, furnace blower, fan, cpap, refrigerator running, washer/dryer, ... these things all mask outside sounds. If I'm outside I'd note them on the highway 1/4 mile away but wouldn't pay much attention unless they turn off the highway. Also they said they were out for the evening. I've never heard anyone ask out where, or if alcohol was involved. The timing might go well with going out for dinner, or to a friend's house, or a couple hours at the casino... any of which would go well with having a couple beers. They're retired aren't they? Sunday night is the same as any other.