Thanks for the valuable insight @Derek Smith.
@Wayne Brooks and anyone else that would like to reply here is some more details regarding this short sale:
The listing agent said:
"we need a signed price addendum with the new offer price in order to obtain the approval letters. Forward that to me as soon as possible and I will get it signed by the sellers so we can move forward"
I sent an updated offer for the sellers to sign then the short sale negotiator said that he would be sending the P&S. As the P&S date read "7 days post lien approval" we discussed that the post lien date would be last Friday since that's when the buyers said they would accept the banks counter offer.
We expected to sign the P&S this week, but now we are being told that it will take another 2 weeks to get the approval letter from the bank so we need to postpone the P&S date.
Since the bank came back with a new offer and my buyer's accepted I was hoping to move on to the P&S asap.