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A good technician can tell what happened within minutes of having the motor apart.
Starvation will present itself much differently than a dropped valve seat, broken ring, or blown head gasket. If they fired it up with no oil, it will be visible.
While it's still in the truck, do both a compression test and a leak down test. It's pretty easy on a 4.7L V8. Then, pull the head on the bank where that cylinder has no compression. Then drop the pan.
If they forgot to fill it and ran it for a minute, that damage would be clearly evident. If it had any other type of damage, it happened over a period of time and would also be clearly evident.
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-Eric
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