@judikidd Great question. 

As I understand it, this is a SPLIT Signing. You’re providing your professional services today with the Buyer(s), but your query is specifically about the date on documents the Seller(s) & previous notary/professional signing agent [PSA] executed on 17JUN23, but dated for 20JUN23.
WoW~ That’s a FIRST!
You’re not asking about pre-filling in dates on your documents prior to your signing today.
SHORT ANSWER: Those documents, as you’re inferring, SHOULD be dated on the actual date they’re executed: 17JUN23.
I’m uncertain why anyone at a Title/Escrow Company [T/EC] (or anyone else) would instruct the signers & PSA to date it differently from the actual signing date.
Of course, I’m cognizant you’re already aware there’s NO reason under any circumstance that anyone would alter the Notarial Certificate of the Seller(s) package that a different notary/PSA already executed.
Certainly, I wouldn’t cross anything out on the 1st signing Notarial Certificate. Thankfully, your Notarial Certificate is dated correctly, so no need for a correction.
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Your question of is there a State the signers & the PSA would predate to reflect the date of the transaction close, instead of the actual date of the signing . . .
In my direct experience of executing many Split Signings from MULTIPLE States over the years, when performing the 2nd signing, the previous signers (usually the Seller(s)) always dated THEIR documents on the date executed.
I’ve never seen it happen any other way.
So, the Seller(s) package that you received in preparation for your Buyer(s) signing, in my experience, would be an anomaly.
As those predated Signature Blocks and Notarial Certificates were executed at the previous signing on 17JUN23, it would fall outside the purview of my responsibilities. I’d just attach a Post-It Note to the first page of the returning package noting the date discrepancy from the actual date executed by the previous signers. It’s the T/EC responsibility to coordinate and facilitate with the the previous signers, as you’re already aware.
Also, when executing a Split Signings as the 1st signer, I’ve always dated, as required, on the date of the actual signing.
