[mothered]

Yes I did sign for it, and it's not light at all. I told them that there were almost no lego parts left in the box.

The driver delivered it to my hands, so I don't know if I can tell them that it was wet and soaked when delivered. I could however claim that it was dented and damaged inside the cardboard box which could not be used a birthday gift, but it is a very weak excuse in my opinion.

Use the "wrong Item received" method.

Purchase something that's significantly cheaper that they stock. It must weigh the same (or close to It) and when they request the return, send them the wrong Item.

I'm not doubting that this could work, but I rather go for a free extra product because mine weighed around 3kg and there's probably no cheap lego product that weighs the same.

Fair enough.

Let us know as the latest developments come to hand.