Another bit of advice:
Even if it is a rejection, call to make sure.
I got a rejection letter from OU and called them. They said, "oh we sent those to all the non-residents who didn't interview this year, disregard it."
It turns out my residency status was in the wrong category, so I just showed up with my mortgage closing documents from four years ago (buying primary property in-State) with a big, fat signature on everything and they let it go.
I assume a lot of people just said, "oh well." 🙁
...maybe they are evil and planned it that way. 😕
No. Can't be.