I'm going to say this gently.
You have some serious issues. That you would thrift a pair of boxers is bad enough. That they are JAB is even worse. That you would boast about it is, well, I'm not sure what it is, but it isn't normal.
I have thrifted a pair of boxers, but they were J. Crew and brand new, still in the package. I once thrifted a pair of woolen boot socks that I was positive were new, but I cleaned them anyway before wearing. I have thrifted Derek Rose silk pajamas. But boxers? To save, what, $5? Whoa.
My mother wears thrifted underwear and boasts about it. My mother also has a switch on her hot-water heater so that you have to plan 45 minutes in advance before washing your hands or doing the dishes. She figures it saves her about $10 a month in electricity. Maybe you should go thrifting with her. That's a haul I'd love to see. Or maybe not.