Very interesting. I also have a Week 38 iPhone 5 (Black/32GB) from F2L factory and it is cosmetically perfect. I have no scratches or scuffs on it. I also have absolutely no WiFi issues at all.
Besides your particular phone, where have you gathered this mass amount of data to conclude that ALL phones from F2L during Week 38 are flawed? I would like to know... I saw the link and still find that inconclusive as the riot happened on Oct 6th which is WAY past when the week 38 phones were built.
There is no one factory where problem phones are coming from; it can be traced to all of them as well as the scratches and build week correlation. Some people have flawless week 35/36 phones and some have scratched week 40 ones. Correlation FAIL, you LOSE therefore you get NOTHING, good day, sir.
I wasn't trying to get anything form this post... I'm making assumptions based on information I shared, in case there is a pattern......
At this point, I regret even offering information or even signing up to this site.
Good day, Richard.