Someone is trying to lie here 
Fortunately for us, every post is archived; This is what you said at first before editing the post
In 2014, Bitcoin's average price was $300-$400, sometime it even reached $700- $800
Let's say we consider the lower price $300, are you trying to say you sold the laptop at a flea market with (19,400 X 300) = $5,820,000 worth of BTC in it?
Fortunately for us, every post is archived; This is what you said at first before editing the post
In 2014, Bitcoin's average price was $300-$400, sometime it even reached $700- $800
Let's say we consider the lower price $300, are you trying to say you sold the laptop at a flea market with (19,400 X 300) = $5,820,000 worth of BTC in it?
Good digging out there, you have managed to bust the guy out. What on earth is his purpose lying to us in this case? Can he gain something out of this? What is it that he is trying to accomplish? Those BTC are huge and should prove that he is the real owner somehow.