CARTRIDGES EJECTION ON BF109

[gilles collaveri]

Dear all,

I have a big concern: I found 7,9 X 57 cartridges on a Bf109 crash site (The 109 was most probably a Friedrich or a Gustav).

This matches quite well with the machine guns on board (MG15 or MG181Z)

but the issue is that they have been used (see pictures).

As far as I know, on a 109, the cartridges were ejected after firing.
So I should not have found such items, unless the aircraft had a dedicated container to collect them. Did such container exist ?

What could be the explanation ?

Thanks for your suggestions;

GC
Markings on the cartdridge:
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hlb: Metallwarenfabrik Treuenbritzen GmbH, Werk Selterhof
S*: material : brass
11: 11th lot
42: 1942