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Those numbers and letters are there.
You just can't see them.

http://www.whalercentral.com/articles...cle_id=103

I have mentioned many times on this site, get yourself a magnifying glass and a flashlight and look at the HIN tag from all directions.
You may see the faint letters. (maybe not)

All HIN numbers have 12 characters with no spaces and they all start with BWC which stands for Boston Whaler Corporation.