Considering there were supposed to be somewhere between 9 & 10,000 of all variants built (depending on which source you read), and even accepting that the first year or so production was exclusively for export, that's not a big number is it ? I haven't done the sums for the equivalent 2 seater Elans but just a casual glance indicates they have twice the survival rates from a similar total production run, albeit over a longer period.
I remember in the 80s/90s (?) there was a drain to Japan but that tended to be top class cars making the headlines rather than folks exporting wrecks for rebuild so I'm not sure we can say that's where the missing thousands are.
C'mon, own up, who's got 'em ?