I don't think so. They kept them under sterile conditions. The point I'm making is that organic material falling on the earth will also fall on the moon. The only indication of any organic material of consequence on the moon involves porphyrins.
That sounds reasonable if organics are floating around freely in space. If they're restricted to comets and comet fragments, then dispersal without an atmosphere would be difficult.
I've always felt that comets were rather odd, BTW. I mean, they're described as being huge conglomerations of water ice and miscellaneous space detritus. They're as much a fixture of our solar system as planets. How could such things have been created in such numbers?