Real or Fake Submariner "Hulk" and GMT-II Master "Batman"

[kjkim88]

There are two postings on Offerup in my local area by the same seller for a Submariner 116610LV aka "Hulk" and GMT-II Master 116710BLNR aka "Batman".
Both are in new or mint condition and suspiciously priced low, $5,000 and $4,000 respectively, way below market value. The reason for the low prices? He wants to "help" people who can't afford them by selling at a much lower price so that they can be able to own a genuine Rolex.
The seller has the box and papers and can provide a "certificate of authenticity". The posts are a month old and the seller claims they are still unsold. He will allow transactions via paypal to protect both buyer and seller and offer 30 day money back guarantee plus will pay for return shipping because he is a "legitimate businessman."
Below are pictures of each. Batman pictures are blurry but the seller says they're the best he can provide. So the question is are they real or fake? I'm aware that the newest replicas are ridiculously hard to spot now.

I was so close of buying both but really needed to take it one step at a time and slow down, even if it's through Paypal. He has zero history and only has these two listings on Offerup. Rule #1 when buying a Rolex or any luxury watch is, "buy the seller". I can't obviously in this case. What are your guys' thoughts?