Beef Knuckles - Butcher vs Pet store purchase

[PetFriendly]

I'd like your opinions on something. Before Christmas I bought Charley two beef knuckles from the pet store. From the look and feel of them they have been basted in something (or maybe it was smoked). They have also been sliced in half (or maybe thirds) so the dense marrow is exposed.

He's chewed one down to almost nothing and is slowly working on the second one. They are not cheap to buy ($6 for two I think it was) and I'm wondering if something I bought from the butcher would be as attractive to him for as long. I realise the butcher ones would be more juicy so I have a concern on two levels, one is bacteria and the other is will he even like it if its not smoked?