Just because Blizzard said they patched or designed something one way doesn't mean that's for sure set in stone or something is impossible, heh. Learned that easy over the years. However, the cache doesn't take into account where your character is when it's sent to your stash, but where the quest was turned in so it knows what act-specific cache only lewt can be generated. Where you pop it doesn't matter, either. This isn't entirely accurate, but think of it as another container or like the Cube in D2 and how items dumped out of it when you dropped it with full inventory.