I have received no letter from the ATO so yesterday I got onto
http://www.ato.gov.au/super/content.asp?doc=/content/33301.htm
which is a tool that will look for your lost superannuation and
provide you with possible matches.

Previously this has shown no matches, but now it shows "a possible
match with ...Superannuation Holding Account Reserve (SHAR) and/or
superannuation guarantee records".

It says to ring 13 10 20, which I did just now, and I must have got
through to the sheltered workshop within the ATO.

The call centre person couldn't find anything under super guarantee
or anywhere else, and after about 25 mins of me insisting there was
something there in Super Guarantee, and she wanting to know when it
was paid and what super fund she should look in for it, and thinking
an assessment was issued against OT, she put me on hold for 10
seconds and must have asked someone else because she came back and
told me it was there under super guarantee, and how much it was.
Like the others it is about 10.something percent more than the total
amount of super we should have got (i.e. approx 110% of the amount
we were owed, not 43% of it).

For some reason, the ATO has my old super fund (which has closed)
recorded as my current super fund, so they want me to send in a
Super fund nomination.
http://www.ato.gov.au/content/downloads/nat8676.pdf

Note the fax number on the form is wrong - I was told the correct
one is 1300 139 024.