Thank you so much.
So movies are listed in both the wishlisted and owned ID lists. Will have to give priority to solving it, hopefully this weekend.
As for Hearts of Iron II, MaGog knows the ID's of games I do not own, but it has no way (that I know of) of finding out the ID's of constituents of an unbundled game if I do not own it. Previously, MaGog was able to figure it out by comparing the sub-game's name to Barry_Woodward's (and others') shelf on the wiki, but that avenue is now closed because of the new account system breaking things left and right, including the wiki.
So from now on I will have to depend on the reports of diligent users such as yourself.
Concerning Prehistorik, MaGog cannot "Get From GOG" games before identifying them, but the identification happens about half an hour before the results appear online, so depending on when you ran your Get From GOG, it is possible that you did it sometime in that half hour (would probably be 15:00-15:30 Cyprus time).
Finally, I too love boardgames (e.g. Race For the Galaxy, San Juan, Seven Wonders, Lords of Waterdeep, Nations, Saint Petersburg, Thurn and Taxis, etc.), but probably not enough to buy movies about them on GOG (or elsewhere).
Thank you again.