Since:
1. Defensive sprays are inanely classified as "ammunition" under MA law; and
2. The AG's edict declared interstate commerce of lawful products to somehow be under (then) his authority and forbade the out-of-state sale of ammunition components by mail by duly licensed MA residents; then
it would follow that what you propose contravenes said edict.
As the "crime," to the extent it even exists, seems to be committed by the vendor shipping the contraband to the licensed MA resident, the penalty would also seem to be only on the shipper.