On the web there are two sites which can give you all the addresses/compressed addresses and the private keys for all existent and non existent bitcoin wallets.
As an bitcoin owner don't be afraid that someone can access your wallet and spend it because the chanche of finding an wallet with bitcoin in it is small. To make an idea abbout it
on one of the sites which I fill give it to you, there are 1809251394333065553493296640760748560200586941860545380978205674086221273350 pages and on every page are 64 rows and each row has two wallet address the extended address for that private key, and the compressed one. You can have better chances to win the lottery. Also if you are a lucky bastard don't steal!
Links:
- http://directory.io/ (currently down)
- http://btcdirectory.azurewebsites.net/1