About the only branches I wouldn't use are cedar...many of mine are oak because that's what's around. If you notice a scent, you might also consider coating
them with a no-VOC waterproofing product...it's totally snake-cage-safe when dry & would help the branches shed cage dirt in the future too. But as much as
I think it's a good idea, I haven't bothered coating my branches...it's so easy to just get more...but that might be a consideration if yours were hard to come by,
especially if they fought hard to avoid being caught?
And yeah, sorry about the bark & lichens but that's where most of the issues are. Once in a while, one of my un-baked branches will come with a beetle-
as far as I can tell they're harmless & remain in the branch, slowly chewing holes in it...I only know because I'll find a tiny 1" pile of wood dust under the
hole they made.