[dilemma]

My granddaughter thinks my shortbread is the greatest so I like to send some in the family parcel at Christmas time. Unfortunately, it arrives with the cookies all broken ("but they still taste good"). I try to wrap them well with lots of crumbled waxed paper in a tin inside a larger box but it doesn't seem to help much.

Could I make them a little tougher by adding more flour or by kneading the dough longer?

Thanks for your help.