The problem is that even with how the vanishingly small the numbers you placed there would have already resulted in someone finding one in the last 3 weeks given the number of people looking and the intensity with which they were looking.
y'know, drakes equation and all?
In a super simplistic calc, 0.01% means that for every 100 hits of the right type of dataport in the right settlement you would find 1. Anecdotally, there have been enough players that there have been in at least 100 hits on every conceivable dataport in almost every conceivable settlement combination by now.
It would be interesting if we got some stats from the devs on the number of people who have found even 1.