Below is the very good script by Richard L. Mueller to find stale computer records in your domain, i used many times for different client & it worked like charm. It can be run on member server too.
You have to modify the script for your requirement like no of days & Domain name where you want to run the script.
The script will disable all the stale computer & move to the OU named as Inactive & later on you check the log file which is created in C drive named as MyFolder.
Test the script on your lab & then use it on your own risk.
Please save the attached script as MoveOldComputers.vbs from Inactive Computers.doc
Before running the script in your domain, create a OU named as Inactive & also create a folder names MyFolder in c drive in the member system you are trying to run the script.