The gateway’s Traffic in TTN Console does not show historical data; you’ll need to have that web page open to see the packets come in. (And when you leave it open for a long time, then at some point you’ll probably see an error about some expired session.)
(Same goes for an application/device’s Data page, though there one might see recent historical data when one has the Storage Integration enabled.)
Given the (great) location of the gateway I’d really expect to see some traffic… 