Don't worry, the important part is the pony being there and in good condition.

and she looks beautiful.
But, as far as the cello goes, The glue dries out on those boxes and the cello is missing more often then not. (or is half fallen off). and you usually see the boxes beaten up (and sometimes water-damaged because the pony was played with and re-boxed).
I spent years getting all the seaponies MIB, and they are some of the prettiest MIB. Just look at the liner inside- even it's decorated with artwork. <3
My rule of thumb, if *I* LOVE the item, I didn't overpay.

I'm sure you'll be in love once it arrives.