I will do that.

I also asked German Gun Collectors Association about this and following is the reply I got.

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The following information was given by Jon Speed, author of several books on Mauser.

From 1898-1930 period the occasional military
magazinebox which had the extra locking screws was pulled off an
inventory shelf and used on a sporter! This has been recorded on serveral
Mauser sporter models like the Type B , Type S, Type M and even Type A.
This is most often found on early examples through 1924.

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