Craig went to the scrapyard. Plz Answer!

craig went to the scrapyard to empty a trailer of empty cans the scales measured the total weight of 6,007g once his trailer was unloaded the scaled measures 4,999g.

What is the total weight of the load of empty paint cans?

Then, Craig went to the lumber store and picked up 1,298g of 2x4 lumber to build a deck

If he went over the scales again, what would the scales read, in mg?