We used putty alos, and it was funny to see that our decorations would come up missing and then the next day they would put them back and rearrange all the other ones on our door also.
We also caught them red handed taking them off our door. It was girls in their early 20's and I yelled at them, and they put them back right away. They were only 2 doors down from us, and when they came up missing again, it was a little obvious to who took them.
They are very fun to have and we got lots of compliments. Have fun with it, but don't be bummed if some of it comes up missing.