I had that same problem with another Microsoft mouse, the fix that I found was to open up the mouse (pull the little slick pads off the bottom and take out the screws) and pull top 2 pieces off the bottom, if you look where the mouse button contacts the button on the pcb for the mouse, it is...
I cheated... a lot.
I'm surprised they sent out anything, I got everything on an account I used to cheat so far except the zune. It has taken something like 6-7 months for them to decide to ship this stuff.
btw afaik, all of my accounts got zerod and I'm still getting stuff. I don't think them...
I just got a usb flash drive in the mail, and I got another shirt the other day. I must say, the shirts aren't bad (at least the brown ones).
So far I have received:
3 t-shirts
1 usb flash drive
still waiting on:
some webcams
some xbox 360 controllers (if I get a bunch of controllers I don't...