Maybe you are referring to the study by Pruvost et al who compared the extractable mtDNA content of a 3200-year old aurochs bone split in two and excavated 57 years apart? We mention that study in the introduction to this paper.

Exploring DNA degradation in situ and in museum storage through genomics and metagenomics - Communications Biology DNA preservation in archaeozoological caribou ribs from West Greenland Inuit hunting camp shows better quality in newly excavated samples, revealing detrimental effects of museum storage and diverse m...

DNA preservation in archaeozoological caribou ribs from West Greenland Inuit hunting camp shows better quality in newly excavated samples and reveals bone degradation processes in museum storage nature.com/articles/s42...
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