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There was another thread about this same part: https://www.clublexus.com/forums/is-...-not-open.html
We never landed on what the flap part number is...it is believed to come as part of the larger plastic piece that spans the width of the trunk opening.
If you could get the plastic piece out, it's possible it may have a part number molded into the back of it.
If you look at the thread I linked, that part you circled is not the part. That is the cover for the striker bolts.
We never determined what the part number is, or even if Lexus assigned it one. As it comes as part of the larger panel it may not have a part number to purchase it seperately.