Got problems with documents for selling my car

Hi, I am trying to sell my car but I have problems with the documents.

History:
Guy1 is the original owner of the car and he sold it to lady1 through open deed of sale. The documents are only OR/CR and a photocopy of his TEMPORARY DRIVER'S LICENSE id. There is a deed of sale document made and a lawyer signed it.

Guy2 then bought it from lady1 acquiring all the documents. He got a deed of sale document from lady1 with her signature on and 3 ids of her.

I bought the car from Guy2 and I acquired ALL the documents.

Now I am planning to sell this but MY BUYER tells me that he needs 2 IDs of GUY1 since he is the original owner. What happens if I can't contact guy1 anymore? What if I can't contact lady1 anymore too?

I talked with guy2 and he said ready for transfer na daw yung car ownership sa buyer ko. No need na daw kasi open deed of sale noong binenta kay lady1 at sa kanya. Sana po malinaw ito and matulungan niyo ako.

Thank you :)