Hello all ok im at it again and I was told once before that if a s/s has a plate number on it,it is worth more,so how does this get determined?

this is #4431 with plate numbers 1 of them is a cto w/plate # the other is mnh w/plate # in the scotts 2008 its value is $10.00 can someone help me out with what I should start my bid out at please?