Wow this has gone in a whole new direction.
As upsetting and sad as this is, I don't believe that Ember is alive anymore. I don't believe he sold her or someone kidnapped her either.
After seeing how he reacts under pressure I'm now thinking that he's not all that bright and makes snaps decisions that are not necessarily good decisions.
I could see a scenario where he left the store with Ember to meet up with someone for nefarious purposes. He may have left Ember unattended for a period of time while he "did business". When he came back Ember was dead, either a seizure that caused her death, heat, or an accident related to the child not being secured in the baby seat. I just can't understand a person who does the good parent thing when he takes Ember out of the vehicle, goes to pay for gas and then comes back out and puts her back in the vehicle. If he intended to murder her, why go to all this trouble?
Since he doesn't make good decisions as is apparent based on his lifestyle and currently being on the lam, he panicked, hid Ember, and then came up with his story of a kidnapping to cover his *advertiser censored*.
Now he's panicked again and he's on the run and that's made things a 100 times worse for himself.
Once again, it's all about him. All his actions or non actions are all about him saving himself. Ember is not in the thought process and I think that speaks volumes.
Well, we will see. I think resolution isn't far off.