I have several landowners that allow me to drop carcasses on there land. Generally easy to get permission when I tell them that it'll allow me to kill more coyotes on the pile.

I throw em in the work garbage.

I had a carcass dump where, unbeknownst to me, Gary Ridgeway (Green River Killer) had dumped a body.... about half a mile from my house I might add. I later found out that ithe animal bones caused a lot of excitement for the detectives; I guess all of us trappers within quite a large radius were in their crosshairs for awhile.
I had used this dump for about five years; lots of bones. This was in the mid-late 80's
BTW, Ridgeway lived less than two miles north of me. For years prior to his arrest, guys at his work, in the paint shop at Paccar, called him "GRG", Green River Gary.

I dump them out back on my land, and let a couple of other trappers, dump there's also

I dump em out back too. D3 ades of that and even deer when I was processing 100 a year. You would hardly know it. Bones get scattered and drug off. Mother nature covers up pretty quick

Some landowners give permission to dump on their property and the rest I compost at a farm I have permission.

I've had a "bone pile" down in a corner of my property for decades. The buzzards, red tails, crows and other critters feast all fall and winter.

I have one at camp too. Pieces from that one get scattered far. I suspect some of that scattering is done by the same bears that are constantly knocking down my burn barrel.