Look at the serial numbers. There needs to be two serial quantities Situated over the face on the Invoice on either aspect on the portrait. Look at the Invoice very carefully and Be certain that the serial numbers match.[8] X Investigate supply The copyright detector pen is incredibly basic. It https://how-to-tell-copyright-b01098.dsiblogger.com/71848211/the-basic-principles-of-how-copyright-pens-detect-copyright