Filing officers with whom notices of federal tax liens, certificates, and notices affecting such liens have been filed on or before July 1, 1967, shall continue to maintain a file labeled "federal tax lien notices filed prior to July 1, 1967" containing notices and certificates filed in numerical order of receipt. If a notice of lien was filed on or before July 1, 1967, any certificate or notice affecting the lien shall be filed in the same office.
SDCL 44-7-10