It primarily affects your kidneys, spleen, liver and lymph nodes, though other organs may be involved. Treatment of the underlying disease may help stop progression of this form of amyloidosis.
For example, you might be reluctant to close because you're afraid that your customer might feel "buyer's remorse" and stop liking you -- a form of rejection.
If you're taking your goods as hand baggage, then you must show them to customs officials along with your refund form in the last EU country you stop in before leaving the EU.