Cf.
I dropped three movies in the mailbox at the same time.
The one, which I reported mislabeled as described in the referenced post, with the Swordfish sleeve and the Apocalypto content, as well as two others. Netflix has reported the other two "received" and generated "For Fri:" emails based on them. The one that was never what I asked for? It's still not received. There is literally no way it didn't get to them at the same time: the envelopes were all put in a mail slot inside the central PHL USPS building with the same addressee at the same time.
Whiskey tango foxtrot, Netflix.
(And yes, I still can't re-add the movie they never sent me and bump it to the top of my list, if I actually cared to do so, since it's still "at home". The interface still also gets a Fail.)
Update: Okay, it showed up a day later. So stuff they have to handle manually, rather than just scanning the barcode on the returned DVD (potentially through the window on the envelope, if you're conscientious about putting the sleeve back in the right way forward) and repackaging it, takes an extra day.
I guess I'd kind of prefer they actually made sure the DVD and sleeve matched every time, but I can see how this falls under Cray's (apocryphal? The only citation I can find is me) "Divide is better Fast than Right".