I paid him via PayPal and he probably never even owned the lens and
certainly never put it in the mail so I don't think the USPS could do
anything.
I'll certainly go look at the form though.
Thanks
Sounds like your lucky day as the US mail is involved. Go to:
http://www.usps.com/forms/_pdf/ps8165.pdf
and print out form, fill it out, and mail it in. Then, if you've been
defrauded, the offender can get federal prison time. I've used the