500,
Causey's Hunting Report database says it's up to date for reports filed before November 1, 2005. I'm an email extra member, so can search the entire report database.

I did a search for Atkinson at Causey's The Hunting Report and did not get any hits.

Likewise nothing for "Tonder" or "Von Tonder". There was a report for Luis Van Tonder, but guess not the same PH.

Do you know Pierre's outfit's name?