Anyone have any idea if this damage is repairable by a dent/paintless shop ? If not, any estimate what this would run to have fixed ?

Also, anyone able to identify the missing panel that was knocked off that covers between the bed and cab section ? I can't find a part number for the life of me.

 

Best bet to make an insurance claim, it won't be cheap to fix.
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^^^Agree. I believe that part is called a "lower cab corner".