Anyone. did Arpaio

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2. most likely he won't officially, legally have to

in practice, prosecutors would simply drop the case, aware that the pardon exists.

prosecutors should insist on seeing the actual document pardoning him, but after reviewing it and determining their case was a complete non-starter, they would drop the charges.

from a legal perspective, none of this is "acceptance" of the pardon. only if prosecutors decide to continue with the case, thereby forcing arpaio to produce the pardon *in court*, would that constitute acceptance of the pardon.

this is the sort of thing that only gets a judge to chastise the prosecutor for wasting the court's valuable time, so i don't see it happening.