1. Paid $1 for $54. worth of uncanceled US stamps. Use or Sell them?

    I just purchased 2 sets of USPS 1973 Souvenir Mint sets. In the lot were several sheets of additional uncancelled stamps. The face value is about $54. I don't collect stamps. So, the question is... Should I use them up? Or, is it worthwhile to sell them? Or, does the USPS buy them back?