Thanks for this. Very helpful, and still works post-patch (the bubblegum in the gift shop chick's pocket).
Same as you, I was able to do this with 1 stealth boy. Should be easy enough for anyone to do it that way so long as they don't dick around and just take the bubblegum, back out and immediately go back in. I saved after every 3 attempts, any more seemed like I was pushing my luck, but I only had a 21 in Sneak.