I would ONLY leave neutral if there was an issue with the hubs and ONLY negative if there was an issue with the Hubs AND the seller refused to make it right.

Personally I agree with Raygunner. This seems like a positive experience, just give the dude some constructive advice and hopefully he packs his stuff better in the future.

But since your hubs have no issue and you got the stuff really quick, besides what "could" have happened, it doesn't seem like you have any reason to give him anything but positive. That's just my opinion.