You’ll also notice that the Taskmaster action figure has his own shield, which can briefly be seen on the ground during a snippet of the Red Guardian vs. Taskmaster fight in the Black Widow trailer.
We’ll have to wait and see what happens to Red Guardian’s shield, i.e. if he just temporarily misplaces it or if it’s somehow destroyed.
While it’s unclear if Red Guardian’s shield is also made from vibranium or if the Russians went with a different kind of extremely durable metal, I have no doubt Red Guardian has put his own shield to good use over the years, just like Captain America did with his own during World War II and the modern era.