Little Accessory Collection. A set that is sold as "Full Complete"
Full Complete (Often フルコンプ, furukonpu or コンプリートcomplete) is a term used for boxes that are not randomly packed.
The items are only sold as a boxed set and in blind packaging, but it's guaranteed that one box will have all of the items in its set.
Nearly all boxed merchandise within the Hetalia series is sold like this, with the exception of most trading card sets.
A list of all items sold in this style can be found in the category Items sold in full sets.