can a seller charge STATE sales tax on an item?

[tarps5]

before auction ended i was in contact will seller asking if PICK UP was available since seller and I were located in the same city.

Seller responded that Yes local pick-up was available and i provided him with my personal direct contact information.

After auction was completed, i received direct invoice from seller with not only winning bid price but also SHIPPING and 

LOCAL STATE SALES TAX.

Can seller add sales tax on an item?  

I somehow seriously doubt that ebay seller has a STATE license on which seller would need to pay SALES TAX and seller

is just passing on the tax to a buyer.

Can someone please explain to me how seller can charge STATE SALES TAX?

I am willing to pay sales tax if seller provided me with a copy of State and even Local business license which require seller to pay tax

or shows me tax return indicating that seller has claimed items sold in the past and collected sales tax and actually claimed that tax

on state tax income statement.