My 2000 Boxster developed the dreaded micro switch failure which caused me to be unable to lock the car and produced the dreaded double beep. I grabbed a known good door lock actuator from another 2000 Boxster, but it didn't quite work out. The lock I got was from a Canada/USA car, but my car is a ROW car so it had the "Secure" AKA "Safe" function which the Canada/USA lock didn't have. I was able to lock the car but it would beep on unlock letting me know something was wrong.
I ended up using the 8N1837016B from an Audi TT rather than trying to source the ROW part, and it worked perfectly.
I imagine it would also work perfectly for the Canada/USA cars but I can't say for sure.