Just like everything, I think the sign is a representation of your house. It definitely can't hurt to have a professional looking sign and nice flyers. I have signs delivered for free to For Sale By Owners. They are just like the signs I use, but instead it just says "For Sale By Owner" with a phone number on there. If you need one, just call me and I'll send one out for you for free. I know it sounds too good to be true, but honestly it's free. Just call me [phone removed by Zillow moderator]
They are most likely waiting for confirmation from the bank to verify that the tax returns the homeowner gave the bank are indeed the tax returns they filed with the IRS. The homeowner signed a 4506 which gives the bank permission to verify their IRS transcripts. People in the past have created fake tax returns, so now the banks verify them. I have seen this take anywhere from one week to two months to get the transcripts back.