I used to box. I was pretty good, better than i expected. Not a strong hitter but could take the punches and win rounds on points well enough. In my second proper fight, my shoulder got dislocated whilst blocking a big punch. 4 years later I’ve just had a complete repair to a torn labrum, my bicep reattached and been diagnosed with arthritis in the shoulder. Im 34 now, I miss boxing and i was never as fit as I was when i was training properly, but as I sit here, with my arm in a sling for the next 6 weeks I’d like to offer the boring voice of reason… As you get older you break easier, take longer to heal and some injuries are for life.
I know this is an MTB forum where people take risks and get hurt all the time, and i think boxing is great, but if you want to do it, join a local club, do some sparring and train hard rather then entering some dodgy pub white collar comp which is as close to boxing as XC is to those big hucking nutters of last decade.
P.S does your boss mind if you show up to work with your face smashed up? people can be quite closed minded about fighting sports as you get older!