Diaphragm surfaces look good and are original. Capsule box is from a different capsule.
You are taking a chance assuming that a mid-1960s K67 will automatically sound superior to anything that came later.
That is not the case, in my experience. Aside of recent, bass-starved versions, K67 and K87 with plastic diaphragm rings (same acoustic properties) have been excellent through the decades.
Yet, I have encountered excellent, mediocre and awful brass K67 in the same physical condition as this one.
Assuming that you are a discriminating listener who wants more than just a period-correct capsule for your vintage U67, I would negotiated with the seller a three-day trial period.