Is Motherboard' “anonymous” source really anonymous?

Two days ago, Motherboard published an article titled "Former NSA Staffers: Rogue Insider Could Be Behind NSA Data Dump".

https://motherboard.vice.com/read/former-nsa-staffers-rogue-insider-shadow-brokers-theory

Most informations were provided by an "anonymous" source, but the article includes a copy of a "Joint Service Achievement Medal" certificate, which includes a long text describing the said achievement. I guess the text is different for each recipient of the medal. I'm wondering if it doesn't make easy to identify the source?