Officials said there were no obvious signs of foul play.
One body was found last week at the Abitibi Consolidated plant in Snowflake, Ariz., about 175 miles northeast of Phoenix. It was positively identified Tuesday as Thomas Jansen, 53, a south St. Louis County man missing since late last month, authorities said.
The Navajo County, Ariz., sheriff's office told the St. Louis Post-Dispatch that workers at the Snowflake plant found the body in a large container used to collect material rejected in the paper recycling process.
The body of Jansen's wife, Susan, 48, was found May 24 on a conveyor belt at a recycling center in north St. Louis.
Police believe both of the Jansens, who had recently become homeless, had gone to sleep in a recycling container in south St. Louis County in Missouri before the container's contents were emptied into a truck and compacted.