first let me say welcome to L J enjoy and have fun while you hang around
just beaware its addictive

don´t know the fox brand sorry
but I do know either its a new plane or a used plane you want to buy
always have a short straightedge with you to check the bottom is flat
both across and lengthwice …. or atleast at the front just at the front of the mouth
and the back of the bottom has to line up
another good thing is to check if the sides is 90 degree to the bottom …......so its possiple
to use the plane together with a shootingboard
beside that go for hunt both on L J and youtube about how to sharpen.. tune and use a plane
good luck
Dennis