I'm almost positive he was lying.
"he said he fell ill with "severe stomach issues" for hours after eating. He attributes it to food poisoning from the embedded blade."
What, did he see the knife, start crying and say "Oh shit, I have to eat it.. I dunno why... BAWWWWW" And then proceed to eat every single ****ing bite? And then not tell anyone else until after he became sick?
Of course he took the blade out, but even still. When I found it in my sandwich, because apparently he took it home, I would have marched my happy ass up there and shoved the sandwich in their face and got another sandwich or my money back.
Also, since Rainbow-eu has worked at Subway, I know the way they get their bread, which is in thin rolls as big around as a quarter.
So in my opinion he either pissed someone off and it was done on purpose he's faking, and needs to have a knife put in his sandwich, for real this time.