You can search for files using the Raw Query function in the Finder. This gives you the ability to use wildcards to search for files with specific file names. You can also use other file attributes and combine them for even more complex searches. Raw Query is also very fast and can search your entire drive in seconds.
You can use the Keychain Access app on your Mac to create secure random passwords for things that are not necessarily online. For instance, you can create random ATM pins or passwords for apps and other services. You can also store these passwords in your Keychain so you have a backup in a secure place in case you forget the password later on. Check out my book The Practical Guide to Mac Security at http://macmost.com/j-macsecurity