Weary residents in the 1.5-mile evacuation zone around a Crosby chemical plant started returning to their flood-ravaged homes early Monday just hours after a controlled burn destroyed six final trailers of decomposing chemicals at the troubled Arkema facility. But even as the week-long ordeal came to a close, the French-owned company has stayed mum about key details, including how officials ignited the trailers and a full chemical inventory for the 18000 Crosby Eastgate site. Meanwhile, some peeved locals are considering whether to sue the company for keeping them from their waterlogged homes and businesses.