[weegee]

The envelope was printed with an invoice number and the trailer's address, but no name.

It seems odd that the local post office would not have a name for that address.

[Sandy]

The suspect's name was on the envelope. What is not known is what the contents of the envelope were. Since the books were apparently brand new, the assumption is that those books were what was sent in the envelope.

[Sandy]

Oh, I see now that you were quoting the article. The article is wrong.