Most of the NOKL standalone 48' Husky-Stacks are former Arizona & California, bought around 1999, renumbered/repainted into the 2101xx and 2102xx series...
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Don't know the disposition of the later 2012xx series 48' standalone Husky-Stacks... but there's no obvious paint-out/removal of the BN logo... just an obvious remark/renumber.
Add in that the 106 standalones BN bught went to BNSF in the 203xxx series (I've seen a few repainted into BNSF as well)... and that they've only disappeared in the last few years, well after the later NOKL 2012xx cars started appearing...
NOKL did have quite a few former BN three-unit all-purpose 48' Husky-Stacks, these were recently cut down to 40' wells.