This is a very difficult problem to deal with. Root cause probably traces back to the playfield manufacturer and the pin manufacturers are having to deal with the fallout. Shipping a fully populated playfield is extremely difficult. They would have to first fabricate and test brand new packaging to ensure no damage will occur and that it can withstand some amount of dropping. This would have to be done once per pin. In shipping something this delicate and varying, there is no one size fits all solution. If you have ever gone through this process, it is not cheap nor is it fast to get through. The second option would be to have people ship their entire pin back to them. This is also very expensive and full of risk.
I'm not sure what a good answer is here unfortunately. I sympathize with both sides in this case. What a conundrum!