An institution that paid me a research stipend sent me a 1099 then subsequently told me to shred it because I wasn't supposed to receive one because of the source of the funding. I asked if that meant it was tax free and they said "yes." The stipend was also a good sum. Not like what the OP has, but still a good sum. I have waited for any other tax relevant documentation just incase and have received nothing.
The grant's funds were to be used for purchasing anything relevant to my research with the remainder being mine to keep and do whatever with it. Because I had no expenses due to the lab having everything I needed, I had everything as a lump sum and was told it was mine to spend however I wanted. It was a stipend.
I still have the original 1099 because I am super paranoid. Seeing as how I have been given information that seems to contradict your link regarding student internship stipends, what should I do since I have no tax documentation? I want to make sure everything is okay between me and the IRS, but I am also not paying taxes if I do not owe any.