The service personnel said we would need an exact time stamp for them to find the incident. I knew within half an hour but they said that there would be so much code for them to read through that it would make it impossible to find this.
That is actually true.
They REALLY need to narrow it down as much as possible because the logfiles are insanely detailed and therefore large. They are insanely large on purpose because as a troubleshooter, you want as much information as possible. Logfiles that simply say "something went wrong" are not helping anyone. I think you are underestimating what we are talking about. Thousands of lines of log-entries from a multitude of computers and processes (read, a whole bunch of large logfile at the same time) and they need to correlate things like "what a specific sensor measured, correlate that to the latch mechanism of the trunk and and and and. I think/hope you get the idea.
I'm in the same spot but instead of working with cars, I work on high-end storage systems and I go nuts if somebody wants my help and all I get is "hmmm it was an hour ago". What am I? A rainbow farting golden egg laying donkey-cross-bred-unicorn ??
Shouldn't this be something they want to verify to make sure there is no error in the car?
Absolutely. That is why those logfiles are insanely large. But this is a curse at the same time. They really want to help you but you have to throw them a bone and be as specific as you can.
If you cannot remember the time + - a few minutes, it's almost impossible to find any helpful.
To summarize: Tesla is not "unwilling to help you" but you have to give them something to work with. If you can't be more specific, and that's not you fault by the way, then they simply can't help you. They really need a certain level of detail from you.
If you still think "no, bad Tesla" after what I and Linux-works have written, then sorry but then you simply don't want to understand and then the conversation ends.
because it is Tesla with no competition for body work or repair. Would a collision generate some kind of mark in the code?
In Switzerland, there are many non-Tesla affiliated, but fully Tesla certified 3rd party body shops. But trust me, the repair bills won't be far apart if you get quotes from several of them because the parts cost the same to them (sourced from Tesla). So I choose convenience and choose one near by. They've done a good job in the past (which I find more important).