Please ensure to return correctly and ensure to seal properly to avoid the log getting wet.
The hint should give you the clue, but just to give you an extra hint it is not on the ground and what you are looking for is a micro test tube.
Gur boivbhf cynpr zvtug abg or fb boivbhf.
(Cyf or tragyr jura unaqyvat naq ergheavat gur pbagnvare)