Sometimes when I order via Amazon they'll offer extra "anonymous" packaging for certain sensitive, desirable or expensive items.
For the most part I can't complain about excessive size, but I recently ordered a small dropper bottle of food flavouring and it came in a large box that must have been nearly 2 foot long. I thought at first they'd accidentally sent me an empty box as I almost missed finding that tiny bottle within all the crumpled paper filler.