When automating wayback machine and ffuf is not the answer, or manual analysis ftw

Wayback machine is an awesome resource for a quick recon. It helps in finding sometimes obscure paths and endpoints specific to that company’s way of naming things, the words and paths that aren’t in any public wordlists. And a quick way to analyze those endpoints when there are too many for a manual approach is to use ffuf or equivalent. But, what if some of those endpoints that aren’t 200 OK according to ffuf are in fact still useful?