Selling/transfer of motorcycle registration question

I sold my motorbike in Chiang Mai 2 months ago. I completed all the paperwork, had a residency certificate, signed passport page, power of attorney, etc. and gave them to the buyer.

The person who bought hasn’t transferred the registration yet, and messaged me today asking if I can get new documents. I guess they’ve expired.

Should I just ignore them and let them deal with it? I left the country 6 weeks ago. I don’t want to face any repercussions or anything.

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