set of 6 Pokemon balls from 1999 BK

Each one of the Six boxes that contain a certificate of authenticity, gold plated card, with one of the 6 different characters and the ball they are in. These are unused, a few may have had the plastic removed but they were not played with. My grand son got curious to see what was in there. I've seen the sets on Ebay for over $500 and also very cheap. I'm somewhere in the middle. I have many sets, so if you get one at this cost I'll sell the next for slightly less, say $325. Payment through PayPal, Walmart money order or cash if its a door pickup. Will mail out for $7, mailed via ground media mail for each boxed set, 6 boxes.