For reference - some People in the earlier days took massive advantage of the exploit to see what's inside a pack and just grab only those, that contains gold foils + legendary cards and put over the crap-pack to engine ... and repeat. if someone wonders how some early players are have such big collections. read more:

https://peakd.com/steemmonsters/@pharesim/psa-do-not-buy-second-hand-steemmonster-packs