Well I was caught.
She was right outside listening and I underestimated the noise I made from untaping it. Why I didn't bring a pin I can't explain...gah!
And then it was the wrong temperature - when I heated it I think I got it too hot and it stayed that way. So I just left and admitted to tampering with my sample. That constitutes a failure.
Oh well. Back to working at KFC it is...