Since October 2016 Ebay seller jbeerd from Moscow in Russia has been selling these replica Russian plates.
They all have the flag missing and he says it is because it is a type that ”were unofficially given to government and special agencies vehicles“. This is basically not true (this has been checked with people who know a very great deal about Russian plates) and region 772 does not exist.
Genuine used Russian plates are cheap and easy to get from several sellers on Ebay and there is absolutely no need to buy replicas, especially from this seller who likes to make plates that are wrong.
Do not buy replicas as nearly all of them on Ebay are wrong in some way. You will end up with scrap aluminium in your collection.