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You can't make sure.
You can only trust in logic: why would the crematorium mix them up? It makes no advantage for them, but some risk in case the public finds out.
Not talking about just mixing them up. But what if one person goes home and gets ashes out of a fire place then sell them to you as a deceased loved one?
sell them to you
I am not paranoid enough to imagine such a thing.
The ashes from cremation are ground up bones. They should look quite different from wood ash.
What incentive would they have to do that? They need to burn the body anyways to dispose of it; using other ashes would literally be more work. Also there's a pretty big difference between corpse ash and wood ash. They are going to be giving you the ashes of a burned body, there is no logical reason for them to deliberately give you someone elses ashes.