Utilize the input text as a context reference, choose the right relationship between Australia Post and mail from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

The parcel, containing sew-on patches of the club's crest, is believed to have fallen behind machinery in a sorting centre at Australia Post -- the state-owned mail service -- only to be discovered recently when the company moved to another facility, reported Xinhua citing News Corp. Former committee member of the tennis club Irene Garrett, who the package was addressed to, said she "had a good laugh" when the item finally arrived.

Answer: industry