lol tell me a little more what you are looking for... what I was going to say in response to this, you quoted using your above quote as a response to that.
Yeah he ascended in front of how many people? 12?
There probably are a lot of records that were destroyed or something to that effect. Not too long after this Jerusulem was torched to the ground and many of its inhabitants were slaughtered.
Other than certain texts like Josephus et al, the Romans would not really take such pains to preserve any old document. Assuming a lot of people wrote about it, those documents would still probably be lost. The ones that survived were preserved by the Church (and some were written post 70 ad of course).
Even if they were in Rome, Rome was sacked. It is notable that many of the Early Church Fathers and their critics quoted back and forth from documents that we no longer have. There very well may have been a plethora of writing about him at one time, but so much has been lost to history. Also I really want to see what the Vatican is hiding in their library. There are a lot of texts that they won't let anyone touch, and conveniently pull out if they are needed.
In any case, pretty much all writing we have about Jesus Christ treats him as a historical person, and attests to his ability to preform miracles. Sure we cannot 'prove' that he did that simply using history, but we can demonstrate that people believed he could do so.