Although it's not strictly 'NOS', I thought I'd chuck this in as a comparison to that NOS 7A38-7029 which sold in the above eBay auction last October. If you hadn't noticed, such auctions are few and far between nowadays. Sellers prefer to list watches as Buy-it-Now, frequently with fanciful, sometimes risible asking prices, often regardless of condition, in the hope that some desperate punter will come along.
In the middle of June a US eBay seller
pittsburghpickings, who doesn't specialize in watches, listed a 7A38-7029 in very good, almost mint cosmetic condition, complete with box and papers. His asking price was $1499.99. May as well call it $1500. Note that there's no mention of 'Royal Oak', nor the complete model number in his title nor description.
https://www.ebay.co.uk/itm/166170407115

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Examining the photos of the watch, it appeared to be in little worn, almost pristine condition, with an unmarked clasp and a JWC inspection sticker on the case-back.

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The seller (ended and) re-listed it at the beginning of July. It sold yesterday for an undisclosed best offer - incidentally, the only offer made, best I can tell.
https://www.ebay.co.uk/itm/166207066705

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Curious as to what it might have actually sold for, I messaged the seller asking if he was willing to disclose (but not really expecting an answer). He replied: 1200.