Since you can retrieve them on you system, you may just want to keep them from the last exam as proof you are looking at it. If you decide to go the digital route, it will be a moot point.
This doesn't exacly answer your question but I would be hesitant to get rid of records less than 5 years old (hard copy and digital copies) - from page 152 of 2014 FFIEC BSA Exam Manual (157 of pdf):
The record-retention requirements (e.g., five-year requirement to retain relevant OFAC records; for blocked property, record retention for as long as blocked; once unblocked, records must be maintained for five years).
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CRCM, CAMS