Nice idea, Lareds!
So take a sctipt and run it!
Since only 1000 requests per day per IP is allowed you have to prepare your proxy server list, make sure you switch proxy after each thousand.
For each given filing day you will have to do 10000 requests.
6 months x 20 work days x 10000 requests = 1,200,000 requests to scan for ALL 485s in Oct-Mar range.
Good luck!