Farmers' employees can be sacked for buying goods on behalf of a friend or family, states company policy. Purchases for personal use or gifts for others are allowed.
Ms Osborne also "stashed" the heavily discounted clearance stock of Brut under a stand, in breach of company policy, said the report.
The company launched a formal investigation into the incident.
It considered the situation "sweethearting", where employees use their staff discount card to buy goods for friends who have picked out the items.
Just over a month later, Ms Osborne was dismissed for breaching staff discount and holds' policies, said the report.
She had been issued with a final written warning less than five months before the breach, causing her to move from the St Lukes store to the LynnMall store.
The former employee said she was devastated to learn the ERA had backed Farmers' decision to sack her.
She said she was an honest employee, and the items were put aside on the counter to be paid for while she completed extra work after her shift had finished.
The now-unemployed Aucklander said she was considering appealing against the decision.