Yes, he’s tapped them - but we have plenty of REAL Maple trees, and the bugs use the Box Elders for something - probably BREEDING into the Zillions - so they can leave.
With no snow cover and now this crazy warm up, he and his ‘Sugar Mentor’ are not predicting a good sap season here by us. :(
However it might be a fun possibility for people who live in the "Box Elder Belt"!