AI file opens blank - Icons for website - Potential scam

Hi all!

I've contacted a designer to design some icons for our new website. However, when I try to open the AI files that he shared with me via Google Drive, the icons are nowhere to be seen. Illustrator opens the file and it's only a blank white page. Only one layer in the panel. I think it's a potential scam as I tried to contact the designer several times with this matter but he is not responding to my messages. 

I've tried to solve it by going through other people's posts and similar problems but I can't seem to be able to do so. Please help!

P.S. I've tried to upload two of the files here for you to be able to see them, however, this is the message I receive from Adobe for both files:

The attachment's fully customizable retrofittable.ai content type (application/postscript) does not match its file extension and has been removed.