The page doesn't have anything important in Finnish really. It only describes whats being shown, in the photos in a really simple way: Mustavalkokopio alkuperäiskappaleesta. Alkuperäinen, värillinen versio on toimitettu Designmuseoon - Black and white copy of the original piece. Design museum owns the original, colored version.
I've found this 2 image. but in in those picture the "sotasotapoliisi" has a patch on his arm
Nice photo. The patch is 1939 model.
I think they are eating crisp bread (näkkileipä). I can edit the logo out.
Given the early war kit the Soviet POW's are wearing, I would say Winter War.
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Thanks Aleksander, that's a real nice shot of a puukko in its sheath attached to a belt.