IIRC, the founder of IC might have a personal investment in making CTB available to consenting adults, so if they receive a message in code (e.g., "I am aware that one of your clients used your SN but it did not achieve its intended outcome - can you please confirm the purity of your SN?"), they would probably respond. I would contact them, but the last thing I want is more of a papertrail after my N disaster.
Personally, I'm leaning toward two hypotheses:
1) OP was drowsy when she took the SN and did not take the full drink. I know she says she woke up to find the glass empty, but 50 ml is actually a very small quantity of liquid and most of it can evaporate in a period of 10-11 hours.
2) OP received the SN from a source other than IC - i.e., a SS user who claimed to have SN from IC and shipped it to them directly.