Good evening,
The picture is too small to see properly. Was the insect like a small brown beetle that was quite hard if you squashed it?
Have a look and see if there are any clean looking holes approx. 1mm diameter in the woodwork with powdery sawdust around or in the hole. This would be a concern and I would put any affected materials in a sealed bin liner with woodworm and leave somewhere safe for a few weeks to see if there is any change.
Take a look at the link below which might help identify the creature.
https://en.wikipedia.org/wiki/Woodworm
Christopher Capener