Funko manufacturer's blind boxes and distributes them in sealed cases which is the only way to ensure that the mystery figured have not been tampered. A lot of reseller try to weigh the boxes to sift out the rarer figures by weight. By buying a sealed case, you are ensuring non tampered boxes.

This is for a sealed case of 12 boxes. Untampered:
Funko Mystery Minis Batman VS Superman Toy Action Figures
You will receive 1 random mystery mini box

Your favorite Batman vs Superman characters have been given the Funko Mystery Mini treatment! Each pack is a surprise as to what is actually inside them. If ordering multiples contents of blind packs could be the same as these packs are randomly selected. Figures stand approximately 2.5 inches tall which makes them great stocking stuffers and gifts. Collect them all!!