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Not all the ATM works for selling BTC, most of them are only for buying.
But, yes you can sell BTC without KYC on ATMs, I think the maximun amount is 1000 EUR.
Another option is contacting a BTC local Community, there is always people who want to buy BTC with cash. This web is a good tool to locate the communities.
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If he had had bitcoin, would the Bitcoin ATMs would have worked for him (a non-citizen?) What are the other options for getting local cash?