We received a letter mailed 6/13/2008 from Canada to our address stating that we won 250,000 US$ with a check drawn on Elevator Controls Corporation via RBC Financial Services, Inc.
An obvious scam. They want you to get the money to them before the check clears, which it won't! You, and the company who's name is on the check are victims.
It is useless and morally wrong to attempt to cash a check you suspect as being fraudulent. First of all, it won't clear and your bank will charge you a fee for a returned check. If it somehow falls through the cracks and clears, it's still fraudulent. Your bank will have to return the money and will deduct it from your account. And you will STILL be out the returned check fee.
The proper thing to do is provide copies of what you received to your local post office and your state's attorney general (address easily found on the internet). They will take it from there.