Now I need you to take those three bags you have, and blindly randomize them. I'd suggest carefully placing them into the larger bag or shoebox you have there, then very gently mixing them up, or spinning the bag - with your eyes closed of course.
Then, keeping your eyes closed, I want you to reach into the bag or shoebox, and grab one of the smaller bag, and place it inside one of your tall, non-transparent cups on the table in front of you. Repeat this for all three bags, and if you feel like you know which one may contain the ejaculate, then put them back in the larger container and start over.