Hi Yoshiko,
it looks like a short-winged beetle. I have never seen a beetle like this
before and don´t think, it is a museum pest.
Let´s see, what the entomologists experts say…
Best from Germany
Stephan Biebl
https://museumsschaedlinge.de/
Von: pestlist@googlegroups.com Im Auftrag von Y.
Ko
sorry
its about 5mm
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