So Jordan Phillips was one of those. But Beane was still Assistant GM in Carolina when he came out, but he brought him to Buffalo when Miami cut bait. That first spell did work out (spell 2 less so, let's see on spell 3).
The other guys who are in my mind for that were on, or are still on, the Practice Squad. Which is what makes me think he'd have to make it through waivers for the Bills to make a move.