It doesn't seem right to me either but it's happened. The menu shows build 1.1.1.6115 in both dx10 and dx9 modes so I can't explain it but the patch seems have taken. With the CD now not even reading the last thing I want to do is experiment too much and require a re-install so i'm just going to enjoy my luck.I highly doubt that, FarCry worked that way however.
On Vista 64, I had to get a new 1.2 NoCD.
If you have popped your old NoCd back in the game is back unpatched.
Both the Crysis.EXE(s) in Bin32 and Bin 64 Folders must have build "1.1.1.6115" or they aint patched.