Secret Whataburger ketchup numbers

[snopes]

Comment: Each package of whataburger ketchup is numbered 1,2,3,4 or 5 - Is
it true that each number represents a different flavor ranging from salty
to sweet? This is a "rumor" amongst high school students ranging from
Central Texas to the South Coast - we live in Rockport, Texas. Local
whataburger employees seem to know nothing of this.