I have done this. I bought my then pregnant friend a vibrator (she's 27 just for the record). She's no longer pregnant but I had taken it out of it's actual box and put it in a box for cigerrate papers to hide it, and wrapped it. I also wrote on teh back of the box to open in private because her family would have hated me for sending her a toy and they would have hated her.
So we kept it as discreet as we could. They really did think I sent her cigeratte papers X'D.