@vmadman I'm so sorry, gonna have to disagree with you and Dok.
I know that the coin flip theorem might be correct in most cases, but it isn't in this one. You see, each pack has a 0.2% chance of an heirloom. You are guaranteed one at 500 packs. But, even if you are at pack 499, the odds are not 99% that you are going to get an heirloom; they are still 0.5%. The only number pack that does not have a 0.5% probability is pack number 500 itself.
@DarthValtrex is correct, and @RockDokRock , though he makes a very compelling and usually accurate argument, is not. I hope this fully settles this and I don't have Mr. PHD arguing against me, fore I'm still in highschool
