Hi, my husband has recently bought a used x1.. I took the parcel shelf bits out to go on holiday (he was away at the time) and now when I’ve tried to get them back in, they don’t fit. It’s like there’s a piece missing……what am I doing wrong? I am usually good with stuff like this but I just cannot fathom out why it doesn’t fit? There are only two parts to the parcel shelf aren’t there?