you should delete your post - way too many specifics

no unauthorized code is inherently more risky than others

some hotels check and some hotels don't

a particular hotel may offer an extraordinary discount on a certain code, while other hotels give a standard 10 to 20% discount on the same code

extraordinary discounts may be under more scrutiny than standard 10 to 20% discounts

Asia hotels generally, China in particular, check frequently

Europe hotels generally check moderately

US & MX hotels never check, in my experience

Higher-end hotels check more than cheaper hotels