This is contrary but I'm open to debate. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3747529/
> In late May 2003, studies were conducted using samples of wild animals sold as food in the local market in Guangdong, China. The results found that the SARS coronavirus could be isolated from masked palm civets (Paguma sp.), even if the animals did not show clinical signs of the virus. The preliminary conclusion was the SARS virus crossed the xenographic barrier from Asian palm civets to humans, and more than 10,000 masked palm civets were killed in Guangdong Province. The virus was also later found in raccoon dogs (Nyctereuteus sp.), ferret badgers (Melogale spp.), and domestic cats. In 2005, two studies identified a number of SARS-like coronaviruses in Chinese bats.[60][61]
[1] https://en.wikipedia.org/wiki/Severe_acute_respiratory_syndr...
If CCP are covering it up, then of course there will be a lack of direct evidence. The above doesn't prove it conclusively, but it does make it rather suspicious. Why would CCP be hampering the investigations if they have nothing to hide? It was over a year before they let the WHO have a look. Plenty of time to get rid of any actual evidence.
There's also the reports about the leaked state department cables from 2018: https://www.washingtonpost.com/opinions/2020/04/14/state-dep... But I couldn't actually figure out where to find them, so you can discount that one as "not enough evidence to verify".
Those things aren't conspiracy theories. Yes, its not enough evidence to prove it either, but damn does it make them look shady.