Edited 1-10-07
It is a capital letter on all of them, changed to post to correct it (thanks Hermisminiatures! )
Here is a higher resolution scan of "Büffel". I haven't been able to track one down of "Falke". It's hard to see, but the B is a capital B on Büffel. You may have to experiment with zooming in and out on that picture as it stands out better with certain views. I would assume Falke was done in the same font, so to speak, although Tiger and Puma from the other platoon have a different lettering style than Büffel.
It may be hard to find a photo of "falke" for the simple reason that Albert Ernst only had it in combat for 3 days before it was disabled by Russian artillery and then blown up in a brave and daring mission on foot to prevent the Russians from repairing and using it. I don't know how long he had "Falke" before they entered combat. Either way, I can find no photographic evidence of it.
I would imagine that "Falke" looked very much like "Buffel" in terms of the winter white wash over the dark yellow base coat, with there being a lack of white paint where "Buffel" is painted on the side etc. So I think it's safe to say the camo and white wash would be the same. From that point we could have the "Falke" decal made in the same style/font as "Buffel" and we have a good shot of being as accurate as possible, given the lack of a photo.
Notice on "Puma" that the whitewash goes completely over the side, with Puma painted on over it. I'm not sure what color the fill in color on each of the letters.
"Tiger" is painted on this one, although the whitewash was painted around the name.