check the regn book each page closely and check page numbers, 4 items are embossed on the plates: SINDH GOV LOGO, SINDH, ALPHABETS, NUMERALs, anything less ask reason. Take your time query everything to your satisfaction even if seller is skipping your query. any thing doubtful walk away.
be very observant when checking on regn book. I think you just did a favour to yourself by asking the question on this forum. Good Luck