Hallo Shirley,
I think you ought to write again. I haven't had occasion to write to Osnabruck but I have written to the catholic archives at Hildesheim. They apparently misplaced my 8th August email and I didn't know until I wrote to query the length of time some 3 months later. From their receipt of that email it took 3 weeks to fully process and research my request, which was a nice end November birthday present for me.
Best wishes,
Rena