JMHO: they would not be CTO. I think they are used off paper & given the past history with soaking recent SA issues someone (not too intelligent) feels someone else's' effort is worth a little extra $$. These stamps were issued with special adhesive that unlike previous SAs will release from paper when soaked. (But you are correct, buying the stamps & mailing them back on cover to oneself might be a cheaper way to acquire these in a used condition)
