I have a DSC EV-DW4917 433MHz wireless door sensor that I never installed (I've had it for about 4 years). First person in North America to respond gets it for free (sorry international users, postage would be too much). Reply here that you're interested and I'll get with you offline to get address information.
Not that you were going to send it internationally, but DSC region lock their wireless devices so an NA device wouldn’t work in the EU or AU or whatever areas anyway ¯\_(ツ)_/¯