I would have to say be very careful with electronics, especially if they are returns. Maybe just try a pallet or lot to see how the sellers merchandise is, make sure to ask them plenty of questions before you make a purchase. If your going through a liquidator as I assume you will the sales reps usually don't mind answering a few questions that you have for them, if they get uptight about it I would try somewhere else. Find out the best info you can like the % of damaged goods that would be expected in the load, what items you can expect to get in the load and so on.
Hope I was of some help and good luck, JD