Do not give up on this and please don't let J reimburse you half as others have suggested. Just send them the "invoice" J sends you, edit it a bit (write sth like: brown artificial leather bag, red scarf, etc. without any brand names), they will send you a notice of how much you need to pay, it shouldn't be too much, you can pay it even online and you'll get your package as soon as you do so.
It happened to me while I lived in London, no problems whatsoever.
I think it's better to pay the charge than loose half and be left with nothing, no bags all.