public UniqueId getReceiptId() {
            final String receiptIdStr = AttributeMapUtil.create(metaContent)
                    .get(StandardHeaderArguments.RECEIPT_ID);
            return UniqueId.parse(receiptIdStr);
        }
The {@link UniqueId} of the wrapping zip
stroom-proxy/stroom-proxy-app/src/test/java/stroom/proxy/app/MockFileDestination.java