We were going to visit Seattle when in NW Washington state but we opted to go to Sequim instead for 6 nights.
Never got to see the KOA there.
It is unfortunate that sometimes things just don't work out. Usually when I did book a KOA I printed out the confirmation - did you have this with you ?
Of course, if it doesn't show up in their computers result is still the same.
Sorry for your misfortune.
Jo
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2007 Keystone 291RLS
2003 Ford F250, 4x4, SB, CC
7.3L diesel, Banks Exhaust Brake
ISSPRO pillar gauges
Pullrite 15K sliding hitch
2-Honda Eu2000i's in toolbox
2012 Polaris 400
2012 Polaris 330