So you can see why B&H gets way more attention since not many can spot the less-obvious sub-subforums
Its not an issue IMO. Even though, Scam accusation thread is just a sub-board, above newbie level users already know its existence it's just a few scroll down and you can noticed it or maybe they just really forget.
Report threads to moderator, write in comment "wrong board, please move thread to scam accusation" or something similar and mods will move threads to scam board.
I think this is the best way to help them and be reminded that the topic should be move on SA. Let's help mod by doing so to make the use of that board relevant. BH should have room for more topics which indeed needed most.