Really simple question: I just bought a pack with my shiny gold, but alas, accidently misclicked and didn't open the pack. Now I can't find the damn thing, also it hasn't auto-opened it. Nope, nothing... Silly me. Just understood that I can also gain other rare-exotic Runes besides champions too.
It should be in your rune checklist. You don't have to open the pack to receive the runes. You won't know what runes exactly, unless you had a good memory of what runes you had before and do the math.
If you haven't bought too many packs over the course of the last few days, you can go to the rune manager and click on the button to only show new runes. This is your best chance to see what new runes you have.
They actually removed that, probably because it was buggy (switching back to all runes often caused headaches). But it was a useful feature.