[excholza]

Brother, as a brother here mentioned, the taxi may not even be his. I can tell you that a very close friend's husband leases his taxi out whenever he goes away for extended periods. Also, there are some drivers who share taxis (at least here in Canada). I don't understand how you know he reads namaaz if he just comes into your store to pick food up or asks you to hold food for him? Also, I personally know people who have hearing problems... Again, anything is possible.

You could go on making assumptions that could possibly lead you to hold back on giving salaams at some point... or... you could just ask.