Here's a 239 getting its portside wing .50 cal loaded. According to Kari Stenman the photos are dated 16 September 1941, while the photo descriptions give the place as Immola Airfield, Lappeenranta (the previous images were probably specifically from there too). Photo L. Johnsson via SA-Kuva. SA-Kuva #49525, 49526 and 49528.
View attachment 892968 View attachment 892969 View attachment 892970
EDIT: Although, what bothers me a little now is that in the previous images they were filling the box from the side (?) and here they're filling it from the top. So is it even the same type of box?