*historical info incoming*
The Finnish Air Force had several versions of Blenheims as it was the main type of our bomber fleet throughout the war, including the Mk II that was strictly a Finnish speciality being a Mk I fuselage with two wing guns and in the later examples Mk IV engines. The series were as follows:
Series I: BL-104 - BL-121, British built Mk I's (840 bhp Mercury VIII, one wing gun)
Series II: BL-146 - BL-160, Finnish built Mk II's (840 bhp Mercury VIII, two wing guns)
Series III: BL-122 - BL-133, British built Mk IV's (920 bhp Mercury XV, one wing gun)
Series IV: BL-134 - BL-145, British built Mk I's (840 bhp Mercury VIII, one wing gun)
Series V: BL-161 - BL-190, Finnish built Mk II's (920 bhp Mercury XV, two wing guns)
Series VI: BL-196 - BL-205, Finnish built Mk IV's (920 bhp Mercury XV, two wing guns)
Then about the paint schemes, they were dependant on the series when the aircraft entered service. Eventually they all were all finished in the green and black Continuation War Scheme as they were overhauled but these apply for them as they first reached the squadrons:
Series I: painted in Britain, olive green upper surfaces and fuselage, silver dope lower surfaces
Series II: painted in Finland, olive green and black upper surfaces, silver dope lower surfaces
Series III: painted in Britain, olive green upper surfaces and fuselage, silver dope lower surfaces
Series IV: painted in Britain, Dark Earth and Dark Green upper surfaces, black lower surfaces
Series V & VI: painted in Finland, olive green and black upper surfaces, "DN colour" lower surfaces, "DN colour" was actually RLM 65 and got its name from the Dorniers with which we got a huge stock of the paint.
Not a single Blenheim operated by the FAF was captured in flying condition. Those shot down and crash landed are another story but they were hardly capable of flying ever again. In fact, I don't know of an occasion on which any of our aircraft would have been captured intact.