I did not say I have covers from Ahmednagar before this date.
The earliest date I have so far recorded is this postcard.
I might have more scans, but at the moment i do not have time to sort them out.

I have many scans of items from POW camp in India during WWI:
I know to covers from 13 OCT. So not earlier than Yours. Sorry.

12 November 1941
A South African Air Force Lockheed Lodestar shuttle plane, carrying mail for the South African Union crashed at Malakal in the Sudan. Eighteen bags of mail containing registered letters, as well as private and official mail, were partly destroyed by fire. One of the passengers, Major General F.H. Theron reputedly pulled mail bags out of the burning aircraft.

Salvaged mail was handled at the Base Post Office, Nairobi, where mail which could be identified was forwarded to the addressees, and unidentifiable mail was sent to the Returned Letter Office in Cape Town.

Under the terms of the Universal Postal Convention held at Buenos Aires in May 1939, the Postmaster-General ruled that the losses of registered letters were due to force majeure and that liability for compensation could therefore not be accepted. Naturally, this decision resulted in a certain amount of dissatisfaction among the troops.

Does any members have info on this camp ?