Several sages were in an orchard, and a worker there gave them samples of fruit, but Mar Zutra did not eat. And then it seems that the orchard owner (Mar bar Isak, for a mini-Who's Who) may not really have wanted to provide fruit for his guests after all. Also, if one finds small sheaves in the public domain, the finder can keep them - even if they have an identifying mark. But when does the ye'ush - that despair of ever getting your lost object back - kick in?