Lost package in Japan

I sent an express package with Poste Italiane to Osaka, Japan, from Bergamo Italy on September 22, 2025. The package arrived in Japan on September 27, but was never delivered. The postal service website indicates that the package is available for collection at the foreign operator's office. No delivery attempt was made. We don't know where the foreign operator's office is: we searched the post offices in Osaka without success because the tracking number issued by Poste Italiane isn't listed at Japan Post. The Japanese don't know where the package is. I contacted Poste Italiane customer service, which opened a ticket to which I have yet to receive a response despite repeated requests. I sent my request via certified email to the Poste Italiane complaints office, but I haven't received a response. I don't know which saint to turn to. The package contained gifts for my daughter, who lives in Japan, and some necessary medications. Can anyone help me? Thank you.

by Consistent_Abies7914