Sheldon runs away on the train at the end of 7.24, what could have happened next?

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10 days after Sheldon left on the train Amy, Raj, Howard and Leonard were having lunch at Caltech.

Amy "Hello boys, has anyone heard from Sheldon? He checked in every day for 3 days after he got on the train but since then nothing."

Leonard "I haven't heard from him for 8 days, very strange. Let's see how the phone tracking is doing? He isn't showing up on the phone tracking, I last saw he was in Seattle 8 days ago?"

Howard "I can see if I can find him online..."

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That evening in apartment 4A Howard spoke to the other five.

"I have done some searching online for Sheldon, I have tracked him on the train from Los Angeles to San Francisco to Seattle. He then used his credit card with Amtrak to spend $1328.48, he also withdrew $2000 in cash from a bank in Seattle and used his credit card to spend $302.34 in an Apple Store. Since then he has disappeared off the face of the earth. No emails sent from his Caltech email address, no posts to Physics forums or the Star Trek discussion boards..."

Raj said "maybe he is in Texas dude?"

Five minutes later Leonard was on the phone with Mrs Cooper

"Hello Mrs Cooper, this is Sheldon's friend Leonard calling from California. Sheldon has disappeared, do you know where he is?"

"No Leonard, I haven't heard from Shelly for a couple of months, I last heard from him when he returned to California after his last visit to Texas."

"Thank you Mrs Cooper, please let us know if he turns up in Texas."

Penny said "so Moonpie isn't back in Texas, I am sure if anyone would know where he was it would be his mother. Let's try your mother next."

Leonard called his mother.

"Hello mother"

"What do you want?"

"Good to talk to you too. I have news and a question for you."

"Well spit it out then."

"Penny and I are engaged to be married."

"Oh really, and what is the question?"

"Sheldon has disappeared, do you know where he is?"

"Sheldon has disappeared! Oh that is not good news. I haven't heard from him for 14 days, I normally hear from him at least once a week. Please keep me informed about Sheldon, I hope he comes back soon..."

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Meanwhile in Podunk, Kansas, Sheldon's train had made an unscheduled stop due to mechanical difficulties. Whilst the train was being repaired Sheldon went for a walk from the station. Over the road from the station was the 'Iron Horse' Comic Book Store.