In Minnesota, our general contractor pulled off the job on May 30, 2019. They left two large shipping containers, a construction fence, and a gang box on-site. They have not been on the job since. We cancelled the AIA contract with the GC because of substantial breach on December 6, 2019. On January 3, 2020 - they had their sub remove the shipping containers. On the Mechanics Lien they filed on January 24, 2020, they wrote that the last day of work was January 3, 2020. Does the fact that they left shipping containers on the job site infer that they were still providing labor and materials to improve the property?