Southern Caltrans Co. I received a letter in the mail from Southern Caltrans Co. including a check for more than $1,900 Beaverton Oregon

I immediately became suspicious, so I began researching online and could not find any information regarding the specific business name and the website that I was directed to to activate the check was extremely basic, no information regarding contact info, web designer, or anything, just a request to login with provided user id and password and complete profile information.  I deposited the check after activating it on their site, however still suspicious, I waited to see what would happen, the money did post to my account once the bank was convinced that it was legitimate, but then the check bounced.  Fortunately it only costed me $12.00 for the returned check fee, but could have cost more had I followed through with sending the cash via money gram, as mentioned in previous posts, though I still haven't clicked the "Assignment" button on their site.