Hi,
Even if the first employed company is closed, below mentioned options could be considered
--- concerned employee could get the contact of an authorised signatory preferably the person who has signed in the releiving / experience letters
--- Employer could verify the documents like appointment letters, first salary and last three salary slips to validate the information given by employee.
--- During the BG check third party / the employer will get to know whether the mentioned organisation was existing in the mentioned location / not.
--- When an organisation and its whereabouts are not tracable, as he could not be blamed for that.
Regards,
GVS.