As for a prudent modus operandi for any bigfooter who finds significant DNA evidence, here is a basic sense of the steps required for scientific disclosure to the general public:
1. Select at least two separate groups of researchers that can be sworn to absolute secrecy.
2. Vet these two groups for their ability to grasp the importance of keeping the tests private. Prudence dictates that all involved parties must be prepared to assume that once the lid comes off the "cookie jar," it will be only a matter of a few days, or possibly even hours, before the researchers and the bigfooters who either found or currently possess the body are threatened, coerced, bribed, attacked (professionally or literally), or even killed to obtain it, and to cover up its existence.
It has been estimated that one complete bigfoot body is found about once every 3-5 years. There are very good reasons why these finds never become public, and if they do, why they are then switched with hoaxes, and/or bogus data and findings.
3. Distribute tissue/bone/tooth samples to a dozen or so trusted friends in as wide of a geographic and cultural array as possible. Strive to choose friends and acquaintances that do not know each other, and do not know which others have the samples. Resist the urge to give samples to family members. They are the first people who will be interrogated and threatened.