I shipped with no CE mark...they won't open the box to check.
Please make sure you do NOT write masks anywhere in the waybill.. I did say "masks" and the customs (Germany AND Italy):
1. Disregarded my declaration that the value is under the duty-exempt threshold (which varies depending on which country in Europe you ship to)
2. Disregarded my declaration that it was a gift
3. Re-estimated the shipment value to more than twice what it was
Because of the above, the recipient had to pay VAT, duty (as the new assessment of the value by customs was above the threshold), as well as assorted "fees" from the shipment company for paying duties in advance to "simplify" the process (in my case, DHL...avoid like the plague)