OTP tokens are stored in *related* entries:

Not sure how you would determine this in an import?

token key is base64 standard no pad

entryuuid: 94dbeb81-45f8-11ed-a50d-919b4b1a5ec0
syncstate: Add
dn: ipatokenuniqueid=16b6d328-cead-4b71-af5e-0a7b8622b204,cn=otp,dc=dev,dc=blackhats,dc=net,dc=au
ipatokenOTPalgorithm: sha1
ipatokenOTPdigits: 6
ipatokenOTPkey: iWM6XXyQt9GZV/yiPHYW/w4qjpaIJ8IlF6DlFndHe+C/zu4
ipatokenOwner: uid=testuser,cn=users,cn=accounts,dc=dev,dc=blackhats,dc=net,dc=au
ipatokenTOTPclockOffset: 0
ipatokenTOTPtimeStep: 30
ipatokenUniqueID: 16b6d328-cead-4b71-af5e-0a7b8622b204
objectClass: ipatoken
objectClass: ipatokentotp
objectClass: top