I recently purchased 4 copies of BitDefender Internet Security 2013 (retail box, 3 PCs 2 Years) from a eBay seller. The seller stated on his auction page that the keys were never registered and the items are brand new and unopened and only the UPC code has been cut out.
When I received my order today I noticed all the boxes have been opened with one side of the flap removed on all boxes. This made be feel uneasy and suspicious of the seller's claims.
How can I check if my keys are valid and never been used?