Sure they can. Fish stocker dumps fish in lake, reports the info to WDFW, they put it on the web. If it doesn't happen, it doesn't go up. The scenario you're describing is the problem with only having projected plants.
You liked the phone confirmation? Confirmation data for the whole state, at a glance online, feels more efficient to me.
Crazy thing about all this is I don't even care, outside of trying to get my nephew hooked up with brood trout or steelhead. Kid is over anything smaller.