I didn't post about this before, but I, too, ordered from secretsales - on the same day I asked about it on here. My order has just been delivered by courier, and everything seems to be just as it should be.
I bought Lickable lipstick, Devil and Azalea pro-pan blushes, and Prep & Prime Moisture Infusion. They all pass all my tests and I believe them to be genuine. I didn't have anything to compare the Prep & Prime with, but everything seems to be in order.
The boxes pass the scratch test, there are no unusual odours, the lipstick smells as it should, has the right amount of fine sparkle in it and passes the lid test, too. The date code being white seemed a bit odd, but I have googled and found bloggers who bought direct from their MAC store, and pictures show some of theirs also have the date code in white. Devil blush has a 4.5g sticker on the carton, but again, on checking with google, this appears to be correct and I see lots of pictures of this with the 4.5g sticker on. I don't know why Devil is 4.5g and Azalea is 6g, but again this appears to be correct.