Amazon Ground Shipping as ONLY option- NO pickup in my area

I have several large order shipping to a P.O. box where the customer reversed the order of the street address and the P.O. box (this is a known issue and I do not understand why it hasn't been resolved)

The ONLY option listed is Amazon Ground, but there is no pickup service for Amazon ground in my area. I would need to drive these packages two hours to the nearest pick up point. Amazon ground shipping is NOT enabled in my ship settings.

I'm not comfortable purchasing third party and losing my Amazon guarantee for an order of this size. What should I do?