So... New to this concept of mailing for free, and while someone else asked the same general question for clarifying what these details were for, it didn't seem like anyone actually answered what they were for.
The "c/o" spot, I can only assume could be for... the street address, or PO box, given the use of terms I know from the other way of sending mail? I guess we just don't use the added "PO" onto the term "Box"?
More importantly, above all else though, the "[RFD *******]" aspect, what is this about?? I can't deny, since it's seemingly replacing the zip code, my only assumption is about it being a zip code-type of aspect to mailing this way.
I appreciate anyone's time over this, and God bless you all!