EN10204:2004 Type 3.2 Inspection Certification

This is in reference to Type 3.2 inspection certification.

Is it required to get type 3.2 certificate from the steel manufacturer at the mill itself or any third party conducting the test has the authority to issue it from their own test lab without intervention of steel manufacturer? Further adding to my query,

1) If the stamping or markings on the steel plate is lost, can stockist's duplicate test certificates be referred or a recertification of "intent of type 3.2" is required?

2) How the certification is upgraded to 3.2 if the material lies with stockist, has no 3.1 certification previously and has no markings on the plate?

I would appreciate if answers come with bibliography.

Country- India