14. CMKF Creim Macias Koenig & Frey LLP Can I find out if a Seller's Permit number is current? Most states have an online or telephonic system that allows you to verify the seller's permit number. In California, for example the tax Board's has an online Seller's Permit Verification feature. There is no service to give you a copy of a buyers Resale Certificate. These are not recorded anywhere by the state. YOU must get one signed by the buyer and keep the form on hand.