With checkFile = .false. in boundary_input.cfg, I get
20180115 160416.927 TRACE PET0 boundary_input 2000-01-01T12:00:00 running phase 1 of 1 step 0
20180115 160416.927 ERROR PET0 ESMF_Attribute.F90:22358 ESMF_AttGetChar Attribute not set - Attribute not found and default value not given
20180115 160416.927 ERROR PET0 netcdf_input_component.F90:1070 Run Attribute not set - MOSSCO subroutine call returned error