I would leave a neutral feedback and say the seller must learn to better package bikes. Wow you got lucky.
I was really worried when I shipped my last two frames via ebay. One buyer did not leave feedback the other said "nice packing job."
I really had to cut the hell out of the box to get the shipping rate to be reasonable. I had the headtube flush with the box...but it came in one solid piece.
How much did you have to pay for shipping? I see a lot of people shipping bicycles for dirt cheap VIA ebay. It seems like a lot of people are either losing money on shipping charges or making love to postal clerks for a heft discount.