The AP reports that following successful thefts, "Landau would fill out a checklist noting from where the document was taken, whether inventory marks had been removed and whether catalogue cards or other “finding aids” had been removed to further conceal the theft. The pair would avoid documents that had been copied onto microfilm because of the risk of detection."
Savedoff faces up to fifteen years in prison when he's sentenced in February.
Landau's attorney, stupefyingly, said that he wasn't surprised by Savedoff's plea, arguing that Landau had no idea Savedoff was storing stolen goods in Landau's apartment (where thousands of documents were found during searches). "[Landau's] disappointed that Jason Savedoff appears to be shifting his illegal acts toward Barry," the attorney said. Good luck with that strategy.