Advice for a first timer - authenticating at local AD

[49erfaithful]

Hi all! Newbie looking to get my first Rolex. SS Daytona (White).

Here's the situation: I found a local guy (Craigslist) who just purchased a Daytona from a local AD (let's call it AD #1) back in May of this year. His asking price is $9500. I find this extremely reasonable and offered the logical plan - to meet at the store he bought from (AD #1) to have them check it out in front of me, validate purchase, etc. This was the plan until he tells me over the phone that the owner did him a favor and jumped him through the list to get him that Daytona and he wanted to keep in his good graces for upcoming purchases (not look like he was just flipping watches that were in high demand). He then offered to validate at any other local AD.

What should I be on the lookout for and what should I be asking AD #2 to validate? I'm sure they are pretty accustom to this. Is there a standard range in regards to a fee for this?

Thanks in advance!