(...) Interesting. Note how the sheet you received says you "should" include recipients phone number. Judging by that, it appears that it is not mandatory to include a phone number, rather it is just preferred that you do so. (23 years ago, 17-Apr-02, to lugnet.market.shipping)
(...) The local post office (using POS terminals) refused to accept the package without it. YMMV at other facilities with and without POS. The POS terminal asked the retail clerk to enter the phone number. Ray (23 years ago, 17-Apr-02, to lugnet.market.shipping)