In USA it's value of goods up to $2000 before formal entry declaration has to be filed and it gets messy. Lower numbers always look better, so say instead of marking 3120 switch, mark 30 sets. Lower numbers are probably less likely to make them curious about anything. Or say you're going to send 40 keyboard value each of $90, it would be better to split the shipment to 2 places if possible.
Still nothing to say there are not going to be duty or other import tax if they decide to, but it is always less likely on smaller lower value shipment.