Single Blind Box VS Complete Set 

So, is there a difference when purchasing multiple single blind boxes and a complete set?

YES, there is a significant difference! 

When you are purchasing multiple single blind boxes, there is a possibility of getting a duplicate.  Whereas if you are purchasing a full set, you can guarantee yourself on getting all the basic edition toys from the series, and the possibility of a duplicate is eliminated.  This is because we do mix sets when we are refilling our stocks for single blind boxes, and we will not be able to keep track of what is contained in the box. 

So please keep this in mind when you are purchasing multiple boxes from the same blind box collection.

Origin of Blind Box

The concept of a blind box toy emerged from the Japanese Fukubukuro, which stands for "lucky bag" in Japanese.  The lucky bags contain unknown random contents and are sold at a substantial discount, and it could be 50% off or more than the list price of the items contained within (Wikipedia). 

The idea was then carried forward in the Chinese market, and this is where the blind box originated from.