If theyre unbuyable, wait a week or so. Sell the buyable ones tomorrow in your shop. Edit: Thats if you ABed them. You havent specified that in your topic, but it seems obvious.
It really depends on how much the items are worth, as i.need.an.aber said. I'd personally wait a little longer than a week (maybe two weeks?) if they're UB, because you can never be too careful.
if they're common books, just sell them right away. i sell all the stuff i get from igloo AB, all worth <10k each , right away
I agree with bladeoftalwar books are usally cheap so you should sell them fast, but if there like over 50k somehow you might wnat ot wait awhile. Btw a mod should lock this because im pretty sure this question is answered EDIT: Done