Every organization and solicitor firm shall preserve for a period of not less than five years, the last two years of which shall be in an easily accessible place at the offices of the organization or solicitor firm, the books of account and other records required under the provisions, and for the purposes, of the Act. After such books and records have been preserved for two years, they may be warehoused or stored, or microfilmed, subject to their availability to the Administrative Director within not more than 5 days after request therefore.