There were at least 300,000 STEN Mk1 &1*, Sten mk1* serial N294024 was in the Howard stern collection. I have seen 2 in the N240,000 region and I have a Mk1 in the N079,000 range. Most appear to have had lives in the home guard and training environments but I know of one that has a confirmed SOE history and one that surfaced in Franceas an ex Resistence gun. Indeed the resistence must have had a large consignment as I believe it was they who through SOE requested a version that could be stripped down for concealment.
You may also note that lots of these Mk1 &1* guns ended up in film work both during the war and after. Famous films such as The Guns of Naverone used Mk1* guns which I believe were from Bapties.