WOW, if I was selling unlicensed merchandise I wouldn't be posting on these boards using my selling id.

You are now on borrowed time as people will be hitting the report button on your listings and some will no doubt be contacting the right's owners of those images, anyone seeing this having bought from you will probably be contacting customs too as they will not want to be caught with counterfeit imported items.

I hope you realise that a visit from the authorities could have you at best paying a fine and possibly doing jail time especially because you are dropshipping and so importing the merchandise.

If your title says school backpack then that is what the buyer should get, I would have refunded in full and told them to keep it as even though the measurements were in the description the title is equally valid and you cannot afford to get any buyer offside.