Maybe it's reasonable, you can check it in a hex reader but it'll certainly be encrypted however and you'll see apparently empty padding. Nonvol region sizes vary between unit series and what you're seeing is the total available size of the region [2 MiB or 2048 KiB or 2,097,152 bytes] not the size of the actual information contained in it. The example is Post #28 is for a US/EU 3790 with HWID 1101 and it's nonvol region [rgn41] size is indeed 6,272 KiB or 6.125 MiB.
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