No....

What will happen is, when the item arrives at KEH, it will be reviewed by someone, possibly more than one person. Then, someone will call you, and say "we offer you X amount of dollars - do you accept this offer?" Once you say YES, then it will go to someone else who will process this, and make the payment. It may take more than 2 to 3 days or possibly less. If they have a lot to review, it may take much longer. My past experience has been, about a week to receive the call of offer. Then few more days to get the actual money.