Secure Bill Validators for Enterlinks

I got a customer that wants a secure answer for his enterlink bill validator.He keeps getting hit. I've seen something some were out there that looked like it was a stainless steel validator. Ive been googling my butt off and looking through my vendor books, but got nothing so far. Any body got anything to help me out? Thanks.

What validator does he have installed now? Hamilton's STA is the only Stainless Steel validator I know of. Mars has some hard cast steel bezels for some of there validators.