Hi,
We have also been resolving this question via a regular support channel, but I would like to post an answer here, in case anyone else needs it in future.
Even though we were not certain about the precise goal, we were able to use this macro to access the desired property:
{%CurrentUser.PurchasedProducts.Where("[SKUNumber] LIKE '500'").FirstItem.SKULocationEventDate |(identity)GlobalAdministrator%}