If someone sold all the chumatz in their home before pesach, but forgot to sell any chumatz left at their place of work, are they allowed to eat the food left in their office after the holiday?
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Typically, your rabbi will ask you and remind you to sell Chametz at your workplace.
If, however, this slipped past you and you remembered (before noon on) Erev Pesach but it was too late to find your rabbi to sign a contract, you could gather two male Jewish witnesses and tell them that all of your chametz belongs to John Doe (pick a non-Jew who you know), and that would be effective as a sale -- even if you never contacted John Doe about the sale.
If you forget to do this before pesach, it would be assur to eat that chametz -- it would be chametz she'avar alav ha pesach.