Another interesting note is that the box from my first phone was sealed with a 2" diameter clear sticker, while the second was sealed with a 0.75" diameter sticker (picture below). Both say "Made in Taiwan", but I'm thinking they must've been from different facilities.
There are three takeaways from this:
* There are at least two production lines producing the phones
* There are some yellower screens (perhaps a different supplier or assembly line)
* Not all phones have the home button light leakage problem, so you DON'T have to live with it.
That said, I'd rather have the yellow screen than the light leakage.