Ha! I actually just took one for the team and popped in XMO:W and I was indeed mistaken. For whatever reason, I thought that he asteroid fragment recovered early on was IDd as vibranium, but it was not.
Something else I was once sure that I saw in an X-movie that wasn't there was the name "STARK INDUSTRIES" on Magneto's cell. Swore up and down that I saw it. Huh. Musta been the vodka.