I finally got an unsealed copy of Tails Adventure complete with box and manual on ebay. The auction completed at $210 shipped so I decided to list the sealed copy I no longer need with the knowledge that sealed games are always worth more than open copies. If anyone has been looking to add this to their collection take a look:

http://www.ebay.com/itm/121175827103...84.m1555.l2649

I had been looking for an opened copy since 2010 and never found one till now. In that time, this is the only sealed copy I had come across either.