Assuming yours hasn't been removed, Mine's on the left side of the stand assembly, usually visible by the polished pushrod sticking out and small gaitor that keeps the muck and oil out. He would probably have jumpered the wires I said are normally shorted by the switch when the stand is up. This should still leave the in-gear clutch interlock working so you can pull away at junctions with the bike in gear (but not start it in gear) BUT if you forget and left the side stand down, who knows what scramble you'd be in on the first sharp left hander. Bit like having an overgrown peg feeler! Can't imagine a genuine BMW dealer doing this, unless it was a 'get you home' fix.
When I do my service, and knowing how interactive and important this interlock is, I always do some simple checks. From memory they are:
Try to start the bike in gear, clutch out, stand up or down - nothing should happen.
With the motor running try, to move forward with the stand down - the motor should be killed as the rpm rises.
With the stand up, hold in the clutch and with the shift in any gear (stalled motor scenario) you should be able to start the motor and pull away.
Apologies if my memory left something out.
PS There is no interlock function on the centre stand, but that's obviously not a problem.
I got in a bad habit of starting my K on its stand before mounting, so when I had the bike leap forward momentarily (if left in gear) I knew this interlock stuff was important and had to be sorted.
Ride safe - VOX