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Back on topic, Elizabeth does need to be found, and it might take a deep dive in to find her. However, I think that will probably start with information found on TCs computer and other technology, and comments that ETs family and friends remember over time (if they are willing to tell what they know).
I am deeply confused by the TC apologists. Even if they think TC and ET are in love and would make a lovely couple, he stole her. From past cases, if he was caught and did not turn himself in, the worst sentence he might ever get is 2-5 years (at least that's all I've seen and haven't researched this). If they are in love, she could choose to grow up and go back to him when he got out. In the meantime, she should be able to fulfill her teen dreams with her family and friends. The fact that he hasn't talked her into this is more proof of how selfish and creepy he is.
I believe they are being hidden by someone. And I think the only way anyone is going to find them is if ET contacts someone from her past (in secret) and that person tells. I feel this could go on for some time. The longer it goes, the more brainwashed and victimized she is. It's so sad that she has been taken advantage of her whole life. It breaks my heart.