What would you do? Third party courier advice please.

Sold a 99.99 item in December. I wasn’t aware it was being sent to a third party courier but it arrived on the 30th December. The buyer has contacted me today (15th January) saying the item is damaged. They are saying the item arrived damaged at the third party courier 2 weeks ago.

Buyer is showing me pictures from the third party courier showing the damage, but why is the third party courier opening the package 🤷 is that normal?

Suspicious why the item arrived at the third party courier 2 weeks ago and only now the buyer is saying it’s damaged at the third party courier and still hasn’t been sent