Please note the figures I was referring too included the entire France 1940 campaign, not just the Belgiumoperation.
There were considerable losses in the Cherbourg/ LaHavue area. I seem to recall the 51st division lost something like 6 to 8,000 men in the withdrawal, a minor Germandivisional General of the 7th panzer being the officer who took their surrender. From what I recall the Germans did upset the withdrawal of British
troops from Normandy, I would expect a lot of the rifles were lost there.
I do know in some other source I read that the losses of Brens was very significant. Given such a high number of these arms being lost there must have been a fairly significant loss of rifles as well. My recollection was the issue ration was something like 10 to 12 rifles issued per Bren gun issued; a figure of 90,000 is not out of the question given the 8,000 plus Bren guns that were lost.
That said it is my recollection, I am more than open to hearing any figures that indicate the total rifles lost was even lower than 90,000.