Hi!
Your query has been answered satisfactorily on this thread and the newer one you started. We are closing this thread now. Wish you all the best!
As Rubywitch said, you had no risk. I'm just repeating what she said. Any secretions, dried or wet, once exposed to air, is useless and can't infect you.
NO RISK. NO NEED TO TEST.
Any body fluids that had been on your boxers for an hour had long been exposed to air and temperature changes that render the virus inactive.