Some even require a notarized sales contract to make sure the seller is the person who signed the contract.

Since they seem sketchy also let them know they must give you a notarized lien waiver once the work is done. 

They sent me the checks and I had to send them to her for a notarized signature and notarized letter assigning proceeds to me.

Nice, Carlos, except I never put up any security for a neighbor, they just apparently used my identity 26 years ago and since it was never reported on my credit report before now, I didn't know anything about it, and I now have to come up with documents from 26 years ago which I do not have as I thought 7 years was the limit to dispute a witness he used that was an old, ill tenant of his that did not want her rent raised and is dead now, not a bank employee or even a notarized statement that would verify it, to to prove it wasn't me.

I'm dead serious about my willingness to sign a notarized quitclaim deed for the White House and Golden Gate Bridge for $60k, fyi.

Owner authorization/signature, NOTARIZED at the bottom of this page OR a NOTARIZED letter of authorization from the owner giving the applicant permission to apply. which means we (our company) can fill out the app and go through the process without him having to do it which was his main concern.

The biggest things still yet to acknowleged by him or finished is a couple of outlets not working, track light not working, and he hasn't given me a key to my mailbox.the electrical I'm not to worried about, though I am hand delivering a notarized letter next week about it, mostly It's the mailbox.

They wanted a notarized letter or bank statement with available funds which I didn't have.

It is a much stronger statement that you are you than a notarization.

If you have a buyer already you can sign a notarized fee agreement with your buyer however that only secures your fee.