The gas cans Fire Inspector Wilbur Ricker found sitting beside the burning cottage he took to the lab to be tested and then stored them in his barn (The state investigators weren't interested in them.). He brought them to his deposition and they were also exhibits during his testimony in United States Federal Court.
Part of Ricker's 2-18-1981 report of the arson and finding 3 gas cans near the burning cottage
 
Deposition: The tags have Mike's name, date of death and homicide written on them
 
Ricker testifies during his Jan. 8, 1990 deposition of finding the gas cans.