If you have decrypt9, you would do a system file dump of your movable.sed/LFCS_B from there. Use a computer with a hex editor to view the seed in comparison to your current one to see if they don't match. GodMode9 can view these files on the NAND without dumping them.
Create a NAND backup of your current settings, use JKSM to backup your saves, and then restore the old NAND to check (and pray) that there's a different seed in that NAND.
@theoldbucwild - If you have old NAND backups, find a NAND backup that has a different seed in movable.sed or LocalFriendCodeSeed_B, that's about all you can do with just one 3DS.
Do you have A9LH? Hold X and boot and restore the files you were supposed to back up. If that doesn't work, restore a NAND backup from there.
If you don't have A9LH, hopefully you were doing this on an emuNAND.
The 1 3ds method only works if the person has done a system transfer before with the NAND backup they're using. When you think of it, both methods are very similar.
Why? Its past the release date (Unless you're in the EU, which I doubt due to your country flag) and as other posts have pointed out, the only criteria that seems to have mattered is the release date. You're just being silly and paranoid at this point.