If your e-mails to him have been blocked from delivery, there is a very good chance that nothing is wrong with him. You have to actively select "block user" to block somebody's e-mail.
This guy could be a nut job. I'd start by sending him a demand letter. There are quite a few examples listed on the internet.
Give him 30 days to either produce the machines, or refund your money. Then send it registered certified mail. If you go to press charges, the officials will want to see a copy of the demand letter and proof that the culprit received it.
Best of luck and keep us posted about how this turns out for you.