Thought I would come back and update everyone on what happened after I emailed Huggies to let them know about the crystals. Today I heard a thump on the front porch and assumed it was just another parcel delivery so ignored it. When I went out to check the mail (I know, I'm slack but I'm sick of parcels!) there was a package from Kimberley Clark - they sent me a replacement pack of nappies and a letter of apology stating it was probably just too many crystals and they will let quality assurance know!