verified vouchered samples

English to French Science Botany scientific terminology

Age
How old is the sample? — to confirm the timber pre-dates implementation of any applicable legislation.
You should also check where the nearest laboratory / institute is that is competent to carry out identification tests; whether ///////verified vouchered samples//////// or comparative reference profiles / databases are in place to aid identification; what the charges are per sample and what is considered one sample (e.g. one paintbrush or a batch of paintbrushes); and how long the test will take.

From a scientific report listing timber species and including all scientific data as well as definitions related to several topics such as this one indicating how to determine the age of a sample.

I need the corresponding French term used in a scientific document.

Thanks for your help with reference if possible.