How long do employee discount cards last after you resign?

I resigned from a store about a month ago and today I had to go buy some clothes for a new job. The employees there know me of course and the cashier asked me how have I been yatta yatta... she asked me about the discount and I said "I assume I don't have it anymore lol I wish I had it" she asked me... show more I resigned from a store about a month ago and today I had to go buy some clothes for a new job. The employees there know me of course and the cashier asked me how have I been yatta yatta... she asked me about the discount and I said "I assume I don't have it anymore lol I wish I had it" she asked me if they ever took the card I said no and she told me that we should try it and it worked! I felt bad using it but she said it's their fault for not asking for it or deactivating it. I saved 20 bucks. Can I get in trouble for this? I din't know and she din't seem to care and of course the thought of saving is convincing. Tbh I still don't know what the rules are.
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