Reminds me of the 40k orc who time traveled to kill himself just to have two of his favorite gun

Goes to the future and finds no bones. Well, yeah, actually that makes the most sense. Assuming a single timeline, you poof'd out of existence! Of course, if you did find bones, very like they are not yours and now you have a weird Memento situation where you're investigating why you would have buried someone else's bones in your own grave.

Florida man digs up graveyard, says he would be from the past and searching for his own bones

The twist is you get a heart attack while digging up your bones creating a temporal anomaly. Therefore you are the reason time travel is banned!

Are there any laws currently on the books that could be used to prove a time traveler from the past is the rightful owner of their own bones?

How many times, though? How many of "mine" bones would sate the need?

How far in the future? There will be a period of time that his bones aren't his bones, unless the reason of death is caused by past him instantly removing all the bones in his future body.

If I could time travel I'd go back and prevent my own birth.

I don't hate my life or anything, I'd just rather have never existed than have to spend the majority of my life working.