Bank Wants me to waive my right to get a hard copy of apraisal

[Micheas Marroquin]

Today I received a call from the bank. They want me to come to the bank in 2 hours to sign a document to waive my right to get a hard copy of the appraisal value of the property. I had received the letter 2 weeks ago and called the bank that I wanted a hard copy of the appraisal 3 days before closing. So, now he calls me and wants me to come and sign that document. He said the appraiser has not send him the document. They want me to sign it today so we can close on Friday, as planned. Should I tell them that I need the hard copy and postpone the closing another 3 days or should I come an sign it without knowing how much the property appraised for? What if the property appraised for less than the purchase price and we don't have time to negotiate with the seller? 

What should I do? What questions should I be asking? Thank you very much!