I think it's safe to say that the USPS has a problem with metal tri-rings sent in standard envelopes.
OHHHHHHH LOL--
A few weeks ago I got mail from NY-- an empty envelope with a small hole. I had no idea what it was, asked my FB world if anyone had sent me anything... I realize just now this is what it must have been! Ha!
Since my build was a V2 hybrid, I was good with the D-ring, so I never knew what I missed!