public WebApiSearch setDeliverLastFoundDateOfFoundBy(final boolean deliverLastFoundDateOfFoundBy) {
            this.deliverLastFoundDateOfFoundBy = deliverLastFoundDateOfFoundBy;
            return this;
        }
If set to true and foundBy contains EXACTLY ONE element, then in the lastFound-field the date of the last found date of foundBy is returned instead of for the cache
main/src/main/java/cgeo/geocaching/connector/gc/GCWebAPI.java