Hi,
which black floor pieces do you mean?
The black ones for the building itself?
The black ones for the platform?
or
The black one with the roof above?

?
These parts should be rare??? Not here! I guess I have a hole bunch of them....
Last month I saw the auction for the 4300 and it went for a premium price, something a collector would pay but the thing was the black floor was not in the pictures. On a seperate auction there was the black floor with a starting price of $25 that would have completed the set and it did not sell ? ?