ANSWER:

What these people are saying is absolutely baseless and fabricated and they are doing an innovation.

Simply throw them away like how you normally do.

What to do with the bones after consuming (meat)n head of the sacrificed animal on eidul adha…. people here say one should buried it in earth n not let animals like dog to eat it… is there any sin if throwen away all families here do not have enough of land to burry them.