TL with same WV borders:POD must be after when???

I was wondering how late does a POD *have* to be for West Virginia to end up with the *exact* borders of OTL? From looking at the ins and outs of the efforts for Statehood, a POD in 1862 could easily cause West Virginia/Kanahwa to include less of the Eastern Panhandle. (And having the war start either 4 years earlier or later could even change whether or not the Shenandoah valley becomes part of the State)
 
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