As I understand his all post he want to hold bitcoins for three weeks but no one going to do this as he is completely newbie here
But I don't have any possibility to scam or fool the client, in case I do they just get full refund.
Most people here are mature and have no issue providing their ID, so that's not a problem (at least that's what I think).
Yea that's definitely meant for people who ain't ready to show their ID to some random guy on LBC or whichever exchange marketplace or send it to an obscure company. Or their PayPal is stealth (e.g. created with fake details) and the last is very common. If your account is in your name you don't need anything like that.