There are only a few things that will kill a PV panel and it sounds like the person you bough yours from found one of them!
The silicon is very brittle and that is why it is very well protected and the connections are very small and sensitive to moisture, so the hole that went thru the cell might not have fractured it right away but it created a weak spot and the water that got in there took care of the rest.
Check the diodes of course but they are most likely just fine, the issue is that you have a hole in your solid state electronics.
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