Grobbit
Assuming a quiet out of the way area.
"Number one... I am not a dwarf, although I'll forgive you for your ignorance. Number two, they are not your kegs to sell. I'd suggest you all return them to where you found them or be accused of theft. Number three, suggesting that I sell it on your behalf, involves not only further effort on my part, but contravening the laws of the city... thus involving me in such. This would not settle a debt but further increase it."