When question's ask if something exists, and it doesn't - but that's really hard to prove 100% - how does one answer them?
For example, Is there a list of every vessel used in the Beit HaMikdash? - the answer is no, as I explained in a comment (that the is there a list of the 93 vessels used in the temple daily? question got a negative answer.
But there too, how do we prove that such lists don't exist in such rarely learnt location?
So what do we do?
- Leave it open, with comments? Why?
- Answer with a no? How long and detailed should the answer be?
- Close it? Why?