I would LOVE to see a full population test sample... Would be expensive (probably need 5 K - 10 K tests for a significant read, most of which will likely be wasted on "likely healthy" members of the community... but would decisively settle this outstanding question of asymptomatic infection frequency.

The closest data point we have is likely that South Korean church, where I think they hunted down more or less every member and tested them... Doesn't give you a true view of asymptomatic presence in the general population but does provide a cue about relative size vs. known infected...