Credit Report

I know that my credit isn't that good but I am currently working on it but still have 2 accounts in collections. I have a PO Box and have all my forwarded to it instead of home so I'm not harassed all the time. I was currently trying to get a lower rate on my car insurance and used my home address instead of my PO Box. My question is will the collection agencies look at what I put in on the website of this car insurance company and find my home address. I just got a quote that's all but it still made me nervous now that I thought about it because obviously they had to check my credit score (which actually is going up!! :) But I still wanted to doublecheck. Thanks!