The fact that they've been reupholstered is always a bonus, but what you do need to take care about is the fire Regulations. Nor sure where you're located, but over here in the UK if there isn't a label saying that it meets with the current Fire Regulations then your market is extremely limited. Auction houses, charity (thrift) shops can't even take them.
If there is no label, then a maker's name may be embossed on the underside or rear?