Added that code in, and same outcome. So, I found a WP plugin that would allow me to add code as a snippet without WP converting it.
Once I did that, the treasure hunt answeer line showed up in the cart. i added my text to the box, and pressed submit. At that point, I get a pop up on top of the cart that says product combination does not exist. I clicked ok, and the cart tells me it is empty, and to continue shopping. Clicking that of course closes the cart.
hmmm. what now?