My neighbor told me about a guy he worked with who used to go through a burn barrel drum in less than a year. He happened to see a stainless steel drum at a yard sale one day and picked it up for $5. It was a Dupont drum with a number stenciled on it. Luckily, he called Dupont before cutting the lid off the drum. He gave them the number and was told in no uncertain terms NOT to open it! Dupont sent a truck, and two men in hazmat suits picked it up. He asked what had been in the drum but all the guys would say is, it would have been very very bad had he opened it!
Yeah, he was out $5 but sure had an interesting story to tell!