Thats a hard one to answer.
Basically, if the others were preserved well, and treated by whoever did them, with any kind of insecticide, or chemical which moths hate, then they may not be a target for the moth/beetle.
On the other hand, they may already have moved in ... and you just dont know yet !!
Hold one over a clean white sheet of paper, give it a good shake and look on the paper. If bits are dropping off or anything suspicious pops out .. well .. its your call !!.. to chuck, or not to chuck

(as someone famous once nearly said.)
As to whether the sparrowhawk was "infected", prior to you getting it, its purely a guess, as these pests can just fly in through the window or come in on your clothes.
I think we got all that covered now Gooseman.
I`m off to finish an Oryx !!
Cheers
Phil