I was struggling to remove these stickers. On the camera it was quite obvious that there was a sticker there, but not so on the flash.
So I removed the camera one and started attempting to remove something I assumed was there but couldn't quite see on the flash... The corners were practically impossible to get ahold of, then I came up with the "brilliant" idea of using a nail, with the conviction that I could use surgical-precision not to cause any damage, but of course I got to tiny (and quite harmless) scratches and I freaked out, I thought "what if there is NO plastic protection at all and I have just damaged my new phone?".
But I didn't give up.
So then I took duct tape! and after 8-10 attempts, the tiny sticker went off! So it WAS there! and the tiny scratches I had made with the nail were actually on the sticker and not on the phone

.
So there you go, if you wonder if there is a sticker, man there is! and now you know how to remove it: no nails!! and no toothpicks, nothing else, but a simple piece of duct tape and patience (8-10 attempts!).
Good luck!