Not that it is really relevant, but it is very possible that Terri was looking for Infant or Childrens Tylenol, Motrin, Benadryl or Zyrtec for the baby. These were all recalled on May 2nd and have not been available. Even the generics were sometimes hard to get, even 1 month after the recall, due to the higher demand. My kids have been fairly sick from Spring through mid-Summer and I have had to purchase these items on a regular basis throughout the past few months. I have had to go store hopping on more than one occassion to find what I wanted/needed during the timeframe in question. So her reason for store hopping is plausible, IMO.
Now with regard to why LE is asking for witnesses who saw the truck parked in the 2 FM locations, I think that LE is trying to determine if anyone recalls seeing anything odd or unusual, if they saw the truck that day in those locations. I believe that they have video that shows the vehicle parked in the areas indicated, but are not able to determine, if anyone was in the truck and if there was someone, whether they noted anything unusual. My thought is that maybe TMH, DS, Kyron & the baby were in the truck and either TMH or DS went in the store, while the other adult stayed back with the kids.
With regard to TMH driving around with Kyron to all of these places, after already having killed him, I have a hard time swallowing that. Even if she were a horribly evil stepmother, who has never for a day loved that child (and I am not saying that she is), I cannot fathom her driving around with the body of a child she raised for 6-7 years, while she ran errands. I just don't buy that. I would think that she would have disposed of the body as quickly as possible. But then, this case is beyond strange to me, so I suppose that it could be possible.