I'm no expert at all, but I think one of the major differences between SARS-Cov-1 and SARS-Cov-2 origin was within months animals were identified as the carrier of SARS-Cov-1, specifically in May 2003 bats and masked palm civets.

To date, I'm not sure we've found bats with SARS-Cov-2, or even know what secondary host animal made the jump to humans. Obviously China (and the whole world) would be highly motivated to find these sources, and it's been over 15 months.