I believe it as already been repaired. Hence the reason for the larger drain plug. I don't see a big issue hear. Several people have repaired there oil pans this way. You just need to find the correct washer to seal the plug properly. The question remains whether the dealership screwed it up or the original owner. If the dealership did it then its on them. If the original owner screwed it up then in my opinion you can't blame the dealer. They may not have known about it at the time of sale. I would check an auto parts place to find something suitable. If not available go down to your local machine shop and ask the to take a 1" diameter round piece of copper or aluminum, drill a hole in it and cut off a couple of dozen washers. Second thought check the size first. Now that I think of it they have that stupid raised part of the casting next to the hole. I don't know why its there. Not like we are doing any off roading with an FJR. Well at least most of us.
Good 2 go,
Dave