4, fake bitcoin recovery service; their are some people claiming to be bitcoin recovery service, they always claim they can recover your lost bitcoin for you which some of them will request for your private key or your private details which at the end they will endup stealing from you and won’t help you recover any bitcoin, we have to be very careful because mostly newbies are the once that fall victim of all those scam pattern, if your bitcoin have been stolen, Don’t believe any crypto recovery service.
I can understand if the trick is to get a hard fork but there is no recovery service it's either you have the bitcoin or you don't so if you give someone your private key you give them the same degree of access that you have.
The only logical thing is that you have part of the seed (nine out of 12 words) and therefore you need some help to get access to your coins or you forgot part of your password.
The rest of scam methods are easy to detect if you educate yourself, but in the end everything depends on your knowledge, so do not stop searching and asking questions.
According to the OP's description, I think he was talking about fake Bitcoin recovery services from old storage this is common among the early miners of Bitcoin who still have access to their old computer used to mine Bitcoin during the stage of the CPU mining of Bitcoin and the scammer that offer recovery of coins stolen by online scammers.