is this for real? don't you think the owner would realise he had stuff missing and not the money to back the sales?

if it is for real i would bring the stuff back, it was not a mistake in any way. think of it if you where the manager and fired everyone because they where stealing from you. then in revange they sold everything dirt cheap while you where gone. costing you a lot of money.

i am sure if you bring it back he will only charge you what he paid for it orginally and he will most likely give you good deals on everything you buy from him from now on.