Who wants a Certificate Instead of Reward?

As many collectors of portable antiquities are aware, in the United Kingdom, there is a system of generous finacial rewards for those who surrender so-called Treasure items to the Crown. Some people have argued that such a system should be applied globally (see my earlier discussion of Derek Fincham's suggestions in this regard). Fewer of them mention the fact that there is alongside this a certificate which can be awarded to those public spirited finders who forgo the reward. I wonder what the forthcoming Treasure reports will reveal about the frequency with which that has occurred since this was instituted? It was reported that there were about thirty a year, but there does not seem to be very much publicity around the issue.