No CD Key - Does That Mean No Pwn?

i bought it in a set - came with BF Vietnam Redux, BF 1942, BF 1942 Road to Rome, and 2 medal of honour games...My silly friend spilt his hot chocolate on the back of the booklet where the CD keys are when he borrowed the games off me to install on his computer. Is there anyway of getting these CD keys again? or any other way of installing them without the key? Any help is very much appreciated - I need to get back to pwning them nubs!!!!