What is the value of a 1996 US 500 dollar silver certificate?

Please check your item again. It may be a privately-manufactured "instant collectible" but it isn't a genuine US bill:
  • There are no 1996-dated bills.
  • The last silver certificates were $1 bills dated 1957
  • The last $500 bills of any type were dated 1934
  • The last $500 silver certificates were printed in the 19th century