Do we know he was driving around trying to find a place to leave her, or are we just assuming that? (Serious question). The MSM article says his GPS tracked down Smiths Ferry Rd., across the border into NC then back into VA, and directly to that house.
I'd love to know, how far into NC he went. Did he stop anywhere for any length of time? Does he know someone that lives just across the border in Como, NC? Murfreesboro? Maybe, maybe not. It's certainly possible he was just driving around, but it's also possible he had a destination all along and that's why he picked that house - he knew it was abandoned - because he'd gone by there plenty in the last couple of years while on his way elsewhere. (all pure speculation of course)
As for the bullets being on the MPR, that's a good question. I always thought that was strange. In trying to imagine what you might be looking for that was missing if your kid went missing, I'd guess you'd be looking in their room to see what of theirs they took. But maybe that ammo was kept in a specific place in the house, and that cupboard was open and it was obviously missing? It's hard to know with JH herself coming on here and simply telling us why she listed it as missing, along with AJ.