I didn't get any good external silver swirls in a whole case, so I had to buy a couple of special ones separate from my case. Bummer, but that's ok.   The silver swirls with lutz swirls are truly rare I guess.  I was able to obtain 2 examples with the silver bits on the inside of the marble (not confettis) and one of them also has a nice internal lutz swirl.  That being said, my favorites are some of those simpler transparent ones from this run.  I love the lutz swirls and hate the confettis, but still want examples of all the different confetti combinations.  Internal lutz swirls are still so cool...and extremely rare in this run.