Over at TSAMO/German Docs in Russsia, Akte 100/Lagebericht 364 of 4 September 1940 has six pages of shipping claimed damaged or sunk up from 1–31 August 1940:
https://wwii.germandocsinrussia.org/...inspect/zoom/5
And John will be pleased to know that there are nine (by my quick count) involving "ZG 210" and "Zerst. Gr. 210".