Police are investigating after antisemitic graffiti and swastikas were discovered on an invoice for books sent from Britain to Israel via eBay.
Israeli Faith Romano said she was shocked to discover the words "Hitler", "SS" and "Jude" on an invoice sent to her son Michael, 24, who lives in Roash Hay'ayin.
The invoice, which accompanied the book Sumo: From Rite to Sport, was sent from eBay sales company Brit Books, based in Buckingham.
Ms Romano said: "We are not used to seeing things like this, living in Israel. It made me feel sick. It was from a sealed envelope and could not have been tampered with. My son couldn't even touch the book; it was like it was tainted."
She has complained to Brit Books, eBay and the Anti-Defamation League in Israel.
James Acquaroli, operations manager for Brit Books, said: "This incident is of grave concern to everyone here and a thorough and detailed internal investigation has been on-going since Faith Romano brought the matter to our attention. We have now also reported the matter to the police."
An eBay spokesperson said: "This incident is extremely regrettable and we are looking in to it."