Got a letter with a check for $ 998.88.

recieved a letter from dana's app inc. with a check for $ 998.88 with a call to jamie grey so I called and talked to her and she said this is not a scam and to cash the check and call her back  then they will send another check for the remander of the prize which it was for filling out a servey prize of 9700.00.
there is a claim # that i have to use and they will fedX the check to me?

It seems to be legit so far, as soon as the check clears I will call them back but....I have drawn out 300.00 and got it with no problem so ....we'll see

Have you recieved your money too good to be true

So, have you heard anything since? I received this a few days ago & am not sure what to do.