We leave in less than a week a couple days prior to our Basque Tour. Less than 15 min ago I received an email from RS Tours stating we actually do need a negative test prior to starting our trip.
The email says to bring a rapid test with us, perform it before attending our welcome meeting, then show our guide the test. I responded to the email asking for clarification but would you interpret this to mean they want us to actually keep the test to show our guide? The physical test kit showing that is was negative? It says nothing about having a proctored test and showing the QR code or email proving a negative test, it says to show our guide the test.
Maybe someone from the RS office will chime in here!
ETA: it appears the test does NOT need to be proctored. Just bring your own rapid test, test yourself prior to the Welcome Meeting (but the same day), and photograph the test to show your tour guide (or you could bring the actual test to show but, ew….)