Interested in Language
What I need to help with is the bold text:
"Who've you been murdering now?" I said, lighting a cigarette. "I should try the bay, and have a good heavy stone or two in the sack. I'm not in the body-hiding line."
W.H.Hodgson, The Case Of The Curio Dealer, 1917
Does it mean he has no experience in hiding corpses?
Yes, that's what I would take it to mean.