Sadly, I don't know any method of getting the firmware version shipped with. But maybe you can guess with date of the purchase and the date the update released?
Anyway, I don't think it's a big problem as long as you didn't buy it too recently. I bought it at Jan 13th, 2022.
I noticed (and remembered) it simply because that intriguing ".1" in the version "5.13.7.1". I think it may be the point, denoting that Amazon has changed something.
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