@Michael *******
I have the contacts of the sellers. According to the green books, the bikes are in my name. I understand from you, that all the bikes in my garage with my name in the green book are not owned by me? Who owns the bikes then? Please send us all a reference, to what you stated that I'm/we're not the owner without the 'contact'. BTW, we talk about Thai law in Thailand, not the law of the nation you are coming from. The same is true for cars. And yes, if you want to, ask the seller to sign a sell/buy contract, but it does not make a difference in future ownership.