What do you mean "did not disclose", most scientists that had connections with WIV were pretty open about it.
https://www.thelancet.com/journals/lancet/article/PIIS0140-6...
More info on the same topic: https://www.vanityfair.com/news/2021/06/the-lab-leak-theory-...
https://www.timeshighereducation.com/news/under-fire-lancet-...