SCP Reel to Reel

I found these reels in my grandfather's things after he died. Most of them seem to be him, his last name was Sanders. I don't know why he made them, maybe he worked on a radio drama. I'm converting them to digital and uploading them because they are entertaining enough, and maybe someone knows what they are. There were some office documents on letterhead from the "SCP Foundation" in his things as well, but it's all faded and mostly impossible to read.