I hate to say this but I think your Golden Medal in the Order of Leopold II with crossed swords 40-45 isn't correct.
Based on the Royal Decree of 24 January 1994, creation of the crossed swords Korea, it says that the crossed swords must be worn on the highest decoration received in a chivalry order that is at least a Knight in the Order of Leopold II.
It is most likely that the Royal Decree of 18 april 1983, creation of the crossed swords 40-45, say the same.
Personally I would describe the Commemorative Medal 1870 -1871 as an uncommen medal (but I live in it's country of origin, Belgium) instead of a rare one. The earlier, unofficial, medal and the Commemorative Cross of the 1830 Volunteers are examples of medals that are much harder to find.