Yep - this was exactly the point. As I recall your truck and engine both had fairly low miles. So if you really wanted to you could have pulled that engine and sold it.
It would have appeared on the market as a "newer" engine pull with low miles. The OP in this thread is looking to either replace his engine, or buy a used truck, and was wondering why someone would pull a good engine from a truck.
Perhaps without even realizing it you provided the backstory I was looking for but could not remember all that well myself. What happened to your truck makes a strong case for regular oil changes, and regular UOAs. You had the perfect proof.