Since Trek 5 all the dvds have been made in Mexico-not just the ones with the label. Use a magnifying glass on the clear part by the center hole and you will see "Made in Mexico".
I don't know what kind of cases the Best Buy had when they first came out, they didn't have any left by the time I got there, but when I went to buy my copy the next week, they only had the ones with the the overlapping DVD's. I went to Circuit City and found one copy and it had the regular black Alpha Case. That's 3 different kinds of cases so far.
I too got a black case but it is the one where the discs overlap. Really, really, piss poor case IMHO. Thankfully I have "Nixon" on my to-sell list so I swapped cases. Really bad case! No insert sucks too BTW...
What could be the reason for all the different cases? Very odd. The one I purchased was the regular black two disc case that was used on previous Trek releases. However my friend had a black case where the discs are layed on top of each other. Today I saw the title with a white case at Barnes & Nobles. Very strange.