Well its been years, why haven't they found the reservoir yet then? They would obviously want to since it would prove that it wasn't a lab leak, yet as far as I know they haven't claimed to have found it yet.
It's not impossible that it would emerge in bats in Wuhan and spread to animals and then humans from there, just not very likely. Of course we know very little about the start of this pandemic so it's possible that an animal was infected in the south and transported to Wuhan, but that would mean that it happened without producing cases along the way.
[1] https://www.mdpi.com/viruses/viruses-11-00210/article_deploy...
https://www.sixthtone.com/news/1002326/how-chinas-bat-caves-...
We have a huge sampling error problem since SARS clearly came from Yunnan, so much of the research and characterization focus has been in the South -- but bats and bat coronaviruses are endemic to all of China. Hence the caution on relying on this type of thought-process to make sweeping conclusions.
E.g, just "ctrl+F" for Hubei in this paper: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7106260/pdf/mai...
> "Civet cats, a raccoon dog, and a ferret badger in an animal market in Gunagdong, China, were infected with a coronavirus identical to the one that causes SARS in humans save for an extra 29-nucleotide sequence" which demonstrated that these animals had a very close ancestral virus circulating within their populations.
Source: https://zenodo.org/record/3949022#.Y9hn9uzMJqs.
You're mistaking ancestral origin with proximal origin. It took a decade to find the bat virus that infected the civet cats, but the intermediate host responsible for the spillover was found within months.