Die marking of EN5311QI, DC CONVERTER

Hello,

Recently, we had EN5311QI, DC CONVERTER test the authenticity.
The test facility said Decapsulation test revealed die topography with "IC1012" die marking which is not traceable for them.

The facility cannot confirm the authenticity since there are no good samples for comparison with them.

Please assist us whether "IC1012" die marking is considered to be authentic.
Thank you.