I was wondering if they ever made it through customs.
As for the chocolate, yes the oxalates in chocolate can increase the risk of calcium oxalate kidney stones. Oxalic acid found in chocolate, tea, coffee, rhubarb, kale, spinach, etc. binds with calcium forming the insoluble calcium oxalate. This prevents the calcium from being utilized by the body and the insoluble complex going through the kidneys can lead to stone formation. If you are drinking coffee or tea or eating milk chocolate the risk increases.
Acidified magnesium's such as citrate and malate can help break up the stones.