I think folks are shocked that a 2501 could twist up a box blade and are trying to get an idea of what you engaged, where on the box you engaged it (seems like it had to be a corner to put much leverage at the HP of the tractor), whether you were pushing or pulling--downhill maybe?--and what could be done to add steel and solve the weak link on the box frame. 'Look what broke' is pretty common on here, and the folks on here like solving problems, but need information to help. I would think it's take more torque than a 2501 has to twist up a rated box--I'm sure TSC thought you had it on a larger machine (if you weren't clear about it), or sunk in a corner and turned on it in 4wd. Pictures will get you specific suggestions for repair options if you can't swap it. The good news is it sounds like the box frame is fine, just the pins went--not a lot of steel to replace, and an opportunity to make a captured set-up--pics will get you everywhere.