No code was used here. Not too long ago, the Iranians claimed they captured some lizards that were spying for the US. I think the lizards were supposed to be wearing miniature cameras. And a few years back (2006?) they said the same thing about some squirrels.
That isn’t as crazy as it sounds these days. It certainly would be feasible, of course having a lizard on the boardroom table might be a little suspicious.