The fact hat the company was sold means squat. The new company is the successor in all contracts, etc.. that are in place.
However, first sale doctrine says you can sell the stuff you purchased legitimately. You will have to avoid claiming new (unused is better) because you are reselling stuff already purchased retail. Trademark, if only used to describe the product is fine, but you should make it clear you are not authorized/endorsed by the manufacturer.
However, they can still make things painful for you on ebay. For information on that try
http://www.tabberone.com/Trademarks/trademarks.shtml