Many moons ago I used to get various software packages with serial numbers that either gave extended trials, or simply a working number for possible promotion of the product. I've had a look and I do indeed have Ulead Cool 3D Production Studio 3.5, complete with serial.

I have no clue as to whether the serial has been activated (I simply don't remember if I've used it or handed it to anyone else), nor do I know if it was an extended trial that ran out when the Titanic sank, but I'm happy to pull it off the CD and send it to you if you you'd like.