After a run of SARPAC, there were old tapes still remaining in the SARPAC tape list indicating that one active report still remained on the tape.
In this instance, SARPACs using "//SYSIN DD ..." of TAPESEQ=nnnnn (single tape) were performed, and the tapes in question had, at their beginning, a continuation of a report.
As SARPAC cannot move a partial report, the tapes (despite having other reports being moved) continued to hold the partial report.
For future SARPACs of this type: